题目内容
y=sinx(cosx+1)的导数是( )A.cos2x-cosx B.cos2x+sinx
C.cos2x+cosx D.cos2x+cosx
解析:y=sinx·cosx+sinx.
y′=(sinx·cosx)′+(sinx)′
=(sinx)′cosx+sinx·(cosx)′+cosx
=cos2x-sin2x+cosx
=cos2x+cosx.
答案:C
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题目内容
y=sinx(cosx+1)的导数是( )A.cos2x-cosx B.cos2x+sinx
C.cos2x+cosx D.cos2x+cosx
解析:y=sinx·cosx+sinx.
y′=(sinx·cosx)′+(sinx)′
=(sinx)′cosx+sinx·(cosx)′+cosx
=cos2x-sin2x+cosx
=cos2x+cosx.
答案:C