利用第二类契贝谢夫多项式的性质得到了关于正余弦函数的一组有趣的恒等式。

With the use of the properties of the second Chebyshev polynomial, a group of interesting identity of sine and cosine function is obtained.

youdao

利用第二类契贝谢夫多项式的性质得到了关于正余弦函数的一组有趣的恒等式。

With the use of the properties of the second Chebyshev polynomial, a group of interesting identity of sine and cosine function is obtained.

youdao