提示词
一位教授在传统黑板上写出三角恒等式的数学证明，同时讲解方程当前步骤。原文提示词（English）
A professor writes out a mathematical proof for trigonometric identities on a traditional chalkboard, explaining the step he is currently on in the equation.建议模型
Veo / Kling
视频地址
https://media.goodcase.ai/media/video/real-case-02-chetaslua.mp4
