Evaluate ddx[x3sinx]\frac{d}{dx}[x^3 \sin x]dxd[x3sinx].
3x2sinx+x3cosx3x^2\sin x + x^3\cos x3x2sinx+x3cosx
3x2cosx3x^2\cos x3x2cosx
x2(3sinx+xcosx)x^2(3\sin x + x\cos x)x2(3sinx+xcosx)
Both a and c