函数y=x^3cosx+sin(8x+3)+7,求微积分dy

网友回答

dy=d[x^3cosx+sin(8x+3)+7]
=d(x^3cosx)+dsin(8x+3)
=cosxdx^3 +x^3dcosx+cos(8x+3)d(8x+3)
=[3x^2cosx-x^3sinx+8cos(8x+3)]dx