求导 y=log2(x^2)-log2(x)

(1)
y=log2(x^2)-log2(x)
=2log2(x)-log2(x)
=log2(x)
y'=1/(xln2)
(2)
y=-2sin(x/2)(-cos(x/2)).余弦二倍角公式
=2sin(x/2)cos(x/2)
=sinx.正弦二倍角公式
y'=cosx
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