1
/
| 3 3 2
| 3 2*cos (1) 7*sin (1) 2 2*cos (1)*sin(1)
| x*sin (x) dx = - --------- + --------- - sin (1)*cos(1) + ----------------
| 3 9 3
/
0
$$-{{\sin 3-3\,\cos 3-27\,\sin 1+27\,\cos 1}\over{36}}$$
Ответ (Неопределённый)
[src] /
| 3 3 2
| 3 7*sin (x) 2*x*cos (x) 2*cos (x)*sin(x) 2
| x*sin (x) dx = C + --------- - ----------- + ---------------- - x*sin (x)*cos(x)
| 9 3 3
/
$$-{{\sin \left(3\,x\right)-3\,x\,\cos \left(3\,x\right)-27\,\sin x+
27\,x\,\cos x}\over{36}}$$