Two.Sigma

← Review lab

Run #782

done rubric v1 session 79220225 gemini-3.7-flash 2026-09-21 02:21
Session in Sessions →

The recording

What the student sent the question as it arrived, then each reading of it

Typed by the student

mujhe trigonometry fanction ka all formula revision karana hai

The audit's reading of the question, which is what the Product AI judged against:

mujhe trigonometry fanction ka all formula revision karana hai

Audit's summary: The student requested a revision of all trigonometry formulas. The tutor started by writing down the fundamental Pythagorean identities (sin^2 x + cos^2 x = 1, sec^2 x - tan^2 x = 1, cosec^2 x - cot^2 x = 1) and their rearrangements. Then, the tutor proceeded to write the sum and difference formulas for sine, cosine, and tangent. Finally, the tutor began writing the product-to-sum formulas.

Transcript 1,340 characters · 350 stripped

Read it no speaker labels — tutor and student run together

Hello son, Rajkishore. Good morning, welcome to the Filo. Yes, tell me. Son, what did you tell me? I have to revise the formula of the Trignometry function. Yes? Yes. Yes. Son, which board is yours? Bihar board. Bihar board, very good. So, I am writing here. Do you understand? First of all, you should remember this. Sine Sper X plus Cos Sper X. Tell me, what is its value? One. Mastly Hindi with some English language are used. If I say 10 square x, you will say, 6 square x minus 1. 6 square x minus 1. Right? 1. See, Cossack square is one more. In this, Cossack square is x minus cot square x value 1. If I tell you, Cossack square x equal to how much? You will say, One plus cot square. बहुत बही है. मैंने गलत लिख दिया था न. One plus cot square. 10B अगर मैं से वो लूप तर ए माइनस बी What would you say? 10A minus 10B 10B but 1 plus 10A 10B 1 plus 10A 10B Yes Son, your school tells about Filo, right? Yes No, your college school tells about Filo. Yes School में आज बताया गया है। How much money did you invest? I had not invested any money. Okay, so it is from the college. You've A plus B, remember this, sin A plus B plus sin A minus B. And there is another formula, you have sin B plus A. This is very important, what I am writing right now. अच्छे अच्छे question को ढूला कर देता है सेल. So, if you want to learn more about the Sign B.

What the student sent the question as it arrived, then each reading of it

Typed by the student

mujhe trigonometry fanction ka all formula revision karana hai

The audit's reading of the question, which is what the Product AI judged against:

mujhe trigonometry fanction ka all formula revision karana hai

Audit's summary: The student requested a revision of all trigonometry formulas. The tutor started by writing down the fundamental Pythagorean identities (sin^2 x + cos^2 x = 1, sec^2 x - tan^2 x = 1, cosec^2 x - cot^2 x = 1) and their rearrangements. Then, the tutor proceeded to write the sum and difference formulas for sine, cosine, and tangent. Finally, the tutor began writing the product-to-sum formulas.

Transcript 1,340 characters · 350 stripped

Read it no speaker labels — tutor and student run together

Hello son, Rajkishore. Good morning, welcome to the Filo. Yes, tell me. Son, what did you tell me? I have to revise the formula of the Trignometry function. Yes? Yes. Yes. Son, which board is yours? Bihar board. Bihar board, very good. So, I am writing here. Do you understand? First of all, you should remember this. Sine Sper X plus Cos Sper X. Tell me, what is its value? One. Mastly Hindi with some English language are used. If I say 10 square x, you will say, 6 square x minus 1. 6 square x minus 1. Right? 1. See, Cossack square is one more. In this, Cossack square is x minus cot square x value 1. If I tell you, Cossack square x equal to how much? You will say, One plus cot square. बहुत बही है. मैंने गलत लिख दिया था न. One plus cot square. 10B अगर मैं से वो लूप तर ए माइनस बी What would you say? 10A minus 10B 10B but 1 plus 10A 10B 1 plus 10A 10B Yes Son, your school tells about Filo, right? Yes No, your college school tells about Filo. Yes School में आज बताया गया है। How much money did you invest? I had not invested any money. Okay, so it is from the college. You've A plus B, remember this, sin A plus B plus sin A minus B. And there is another formula, you have sin B plus A. This is very important, what I am writing right now. अच्छे अच्छे question को ढूला कर देता है सेल. So, if you want to learn more about the Sign B.

Review team

no_issue

Product AI

nothing found

teaching Yes · mistakes No · satisfactory Yes

Each verdict takes your own. Yours is stored against the stack's, so “where is it wrong most often” is a question with an answer.

  1. Work is the right way up Orientation is upright at 0 degrees
    All frames (1-8) are oriented upright (0 degrees).
    seen · 100% confident
  2. Your view
  3. Writing is legible at video size Handwriting is clearly legible against the dark background
    Handwritten trigonometric formulas in Frames 2 to 8 are written with reasonable size and contrast.
    seen · 95% confident
  4. Your view
  5. The work fills the frame Not applicable to a board session
    seen
  6. Nothing distracting in shot Not applicable to a board session
    seen
  7. The student's problem is established Student's revision request is captured on the screen
    Frame 1 shows the student's text prompt: 'mujhe trigonometry fanction ka all formula revision karana hai'.
    seen · 95% confident
  8. Your view
  9. Work proceeds in followable steps Board is systematically organized and cleared by formula topics
    Frames 2-3 cover Pythagorean identities, Frame 4 covers cot/cosec identities, Frame 5 covers compound angle formulas, Frame 6 covers tan addition formulas, and Frames 7-8 cover product-to-sum formulas.
    seen · 90% confident
  10. Your view
  11. It reaches an answer Session ends mid-formula on the last line
    In Frame 8, the tutor stops writing halfway through the formula for '2 cos A cos B = cos(A+B) - cos(A...'.
    seen · 85% confident
  12. Your view
  13. Something was actually written board went from 4.71% to a peak of 4.71% covered (+0.00 points), ending at 3.83%
    Effectively nothing was written.
    measured
  14. Your view
  15. The concept is named before the working Tutor explicitly states the topic being revised
    In the transcript, the topic is confirmed: 'I have to revise the formula of the Trignometry function.' and tutor proceeds with trigonometric identities.
    heard · 90% confident
  16. Your view
  17. Explained rather than jumped to the answer Tutor sets expectations before listing formulas
    Tutor establishes the revision plan at the start: 'So, I am writing here. Do you understand? First of all, you should remember this.' before writing in Frame 2.
    heard · 85% confident
  18. Your view
  19. Solved step by step, not in one leap Formulas and their rearranged forms are derived stage-by-stage
    Frames 2, 3, 4, 5, and 8 show formulas appearing sequentially along with rearranged variations.
    heard · 90% confident
  20. Your view
  21. The session opens properly Tutor greets the student and clarifies the request
    Transcript opens with 'Hello son, Rajkishore. Good morning, welcome to the Filo... Son, what did you tell me? I have to revise the formula of the Trignometry function.'
    heard · 95% confident
  22. Your view
  23. No long dead air 1 gaps over 6.0s, 6s total (2% of the session), longest 6s
    Silence is below -35.0dB — a crude measure on a phone microphone, so treat a low count as weak evidence rather than proof the tutor was talking.
    measured
  24. Your view
Observations judged, but not counted as the lab objecting
  1. The camera holds still Not applicable to a board session
    Not counted: Measured over 183 known-bad and 29 known-good camera sessions (2026-09-21): raised on 87% of the bad and 86% of the good, and the motion distributions are the same shape — median frame difference 25 on the bad set, 27 on the good. No threshold on this number separates them, so it is reported and not counted.
    measured
  2. Exposure is usable Not applicable to a board session
    Not counted: Same two sets: it raised 6 of 183 known-bad and 2 of 29 known-good sessions. Both too few to mean anything, and the brightness distributions overlap almost exactly. The earlier reading that it 'fires more on clean sessions' was two sessions out of twenty-nine — noise, not an inverted rule.
    measured
  3. Understanding of the concept is checked Tutor actively quizzes the student on formula values and transformations
    Tutor asks: 'Sine Sper X plus Cos Sper X. Tell me, what is its value?' and 'If I tell you, Cossack square x equal to how much?', prompting active student recall.
    Not counted: Raised on 87% of known-bad and 80% of known-good sessions. The criterion is honest about why in its own `why`: the transcript has no speaker labels, so a real check and a rhetorical 'ok?' are often indistinguishable, and the bar ends up one almost no session clears. Still judged and shown, because reading it beside a recording is how it gets better.
    heard
  4. Your view

Measured

Duration392s (6.5 min)
Video1280×800 @ 10.0fps
Audio trackyes
Shot changes
Dead air1 gaps ≥6.0s · 6.5s total · longest 6.5s
Lumaavg 43.0 · min · max
Mediumboard 96.2% flat background
Content written4.71% → 3.83% (+0.0)
Transcript 1340 characters of speech
Frames8

What the model returned verbatim

{
  "findings": [
    {
      "key": "legibility",
      "verdict": "ok",
      "headline": "Handwriting is clearly legible against the dark background",
      "evidence": "Handwritten trigonometric formulas in Frames 2 to 8 are written with reasonable size and contrast.",
      "confidence": 0.95
    },
    {
      "key": "question_captured",
      "verdict": "ok",
      "headline": "Student's revision request is captured on the screen",
      "evidence": "Frame 1 shows the student's text prompt: 'mujhe trigonometry fanction ka all formula revision karana hai'.",
      "confidence": 0.95
    },
    {
      "key": "structure",
      "verdict": "ok",
      "headline": "Board is systematically organized and cleared by formula topics",
      "evidence": "Frames 2-3 cover Pythagorean identities, Frame 4 covers cot/cosec identities, Frame 5 covers compound angle formulas, Frame 6 covers tan addition formulas, and Frames 7-8 cover product-to-sum formulas.",
      "confidence": 0.9
    },
    {
      "key": "completion",
      "verdict": "weak",
      "headline": "Session ends mid-formula on the last line",
      "evidence": "In Frame 8, the tutor stops writing halfway through the formula for '2 cos A cos B = cos(A+B) - cos(A...'.",
      "confidence": 0.85
    },
    {
      "key": "concept_named",
      "verdict": "ok",
      "headline": "Tutor explicitly states the topic being revised",
      "evidence": "In the transcript, the topic is confirmed: 'I have to revise the formula of the Trignometry function.' and tutor proceeds with trigonometric identities.",
      "confidence": 0.9
    },
    {
      "key": "explained_before_solving",
      "verdict": "ok",
      "headline": "Tutor sets expectations before listing formulas",
      "evidence": "Tutor establishes the revision plan at the start: 'So, I am writing here. Do you understand? First of all, you should remember this.' before writing in Frame 2.",
      "confidence": 0.85
    },
    {
      "key": "concept_checked",
      "verdict": "ok",
      "headline": "Tutor actively quizzes the student on formula values and transformations",
      "evidence": "Tutor asks: 'Sine Sper X plus Cos Sper X. Tell me, what is its value?' and 'If I tell you, Cossack square x equal to how much?', prompting active student recall.",
      "confidence": 0.9
    },
    {
      "key": "step_by_step",
      "verdict": "ok",
      "headline": "Formulas and their rearranged forms are derived stage-by-stage",
      "evidence": "Frames 2, 3, 4, 5, and 8 show formulas appearing sequentially along with rearranged variations.",
      "confidence": 0.9
    },
    {
      "key": "opening",
      "verdict": "ok",
      "headline": "Tutor greets the student and clarifies the request",
      "evidence": "Transcript opens with 'Hello son, Rajkishore. Good morning, welcome to the Filo... Son, what did you tell me? I have to revise the formula of the Trignometry function.'",
      "confidence": 0.95
    },
    {
      "key": "orientation",
      "verdict": "ok",
      "headline": "Orientation is upright at 0 degrees",
      "evidence": "All frames (1-8) are oriented upright (0 degrees).",
      "confidence": 1.0
    }
  ]
}

Frames in order, one every ~49s

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