x-sin(x/2)cos(x/2)的导数sin2a=2sinacosa 怎么换的?
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x-sin(x/2)cos(x/2)的导数sin2a=2sinacosa 怎么换的?
x-sin(x/2)cos(x/2)的导数
sin2a=2sinacosa 怎么换的?
x-sin(x/2)cos(x/2)的导数sin2a=2sinacosa 怎么换的?
因为sin[2*(x/2)]=2sin(x/2)cos(x/2)
所以x-sin(x/2)cos(x/2)=x-1/2sinx
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