数学教授三角函数黑板教学视频
一段写实的视频提示词，展示了一位教授在传统黑板上细致地书写数学证明过程，并进行同步讲解。
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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