4 3
3*x *cos(x) + 12*x *sin(x)
$$3 x^{4} \cos{\left(x \right)} + 12 x^{3} \sin{\left(x \right)}$$
2 / 2 \
3*x *\12*sin(x) - x *sin(x) + 8*x*cos(x)/
$$3 x^{2} \left(- x^{2} \sin{\left(x \right)} + 8 x \cos{\left(x \right)} + 12 \sin{\left(x \right)}\right)$$
/ 3 2 \
3*x*\24*sin(x) - x *cos(x) - 12*x *sin(x) + 36*x*cos(x)/
$$3 x \left(- x^{3} \cos{\left(x \right)} - 12 x^{2} \sin{\left(x \right)} + 36 x \cos{\left(x \right)} + 24 \sin{\left(x \right)}\right)$$