y=x[sin(Inx)-cos(Inx)]导数?

问题描述:

y=x[sin(Inx)-cos(Inx)]导数?

y'=1*[sin(Inx)-cos(Inx)]+x*[cos(lnx)*1/x+sin(lnx)*1/x]
=sin(Inx)-cos(Inx)+cos(lnx)+sin(lnx)
=2sin(Inx)