y=sin^2*x的导函数是什么？
y=sin²x\u7684\u5bfc\u6570\u662f\u4ec0\u4e48\uff0c\u6c42\u8fc7\u7a0b\u8be6\u7ec6\u89e3
y=sin²x
\u2234
y\u2018=(sin²x)\u2019
=2sinx(sinx)'
=2sinxcosx
=sin2x
\u6700\u597d\u62cd\u7167\uff0c\u4f60\u5199\u7684\u4e1c\u897f\u6709\u8bef\u89e3
复合函数求导，由外向内，y=sin^2*x
y’=2sinxcosx=sin2x
y=sin^2*x
y’=2sinxcosx=sin2x
y'=2sinx (sinx)'=2sinxcosx=sin(2x)
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