y=sinx+xcosx
y'=cosx+cosx+x*(-sinx)
=2cosx-xsinx
y=2^x+log2x
y'=2^xln2+1/(xln2)
y=sinxcosx
y'=cosx*cosx+sinx*(-sinx)
=cos²x-sin²x
=cos2x
y=sinx+xcosx
y'=cosx+cosx+x*(-sinx)
=2cosx-xsinx
y=2^x+log2x
y'=2^xln2+1/(xln2)
y=sinxcosx
y'=cosx*cosx+sinx*(-sinx)
=cos²x-sin²x
=cos2x