If you are integrating ∫sin(x)ecos(x)dx\int \sin(x) e^{\cos(x)} dx∫sin(x)ecos(x)dx using substitution u=cos(x)u = \cos(x)u=cos(x), what is dududu?
dxdxdx
sin(x)dx\sin(x) dxsin(x)dx
−sin(x)dx-\sin(x) dx−sin(x)dx
ecos(x)dxe^{\cos(x)} dxecos(x)dx