Professor Explaining Trigonometric Proof on Chalkboard

Example and model label from the original library entry. Settings are shown where recorded; this example has not been independently re-tested.

Professor Explaining Trigonometric Proof on Chalkboard

A realistic video of a professor carefully writing and explaining a mathematical proof for trigonometric identities step-by-step on a traditional chalkboard, with clear legible handwriting and natural teaching gestures.

Original Prompt

A professor writes out a mathematical proof for trigonometric identities on a traditional chalkboard, explaining the step he is currently on in the equation.

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