导数在解函数方程和证明等式中的妙用

On Magical Use of Derivative in Solution of the Function Equation and Equalify Testified

在一元函数微分的学习中,我们要善于利用导数的定义来求取函数的极限、解函数方程和证明恒等式.

When we learn the unitare function differential calculus, we shall be good at utiliaing the definition if differential cofficient to receive the limition,and solve the function equation and testify the identity.