三角恒等式证明的一个注记

A Note on Proof of Triangular Identical Equation

有一些三角恒等式的证明,用初等数学的方法难以达到理想的效果甚或解题过程过于繁冗,而利用关于sinx和cosx的齐次多项式定理来加以证明,可达到初等数学方法不能达到的效果.

If some triangular identical equations are proven by means of elementary mathematical method, we will not get ideal result for the process of proof is complicated. If they are proven by homogeneous polynomial theorem of sin x and cos x , we will get unexpected result which can not be obtained by elementary mathematic method.