Aim To study some calculation formula of sine function and cosine function.

目的研究正弦函数和余弦函数的一些计算公式。

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

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。

youdao

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

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。

youdao