(1) $\displaystyle\int x \sin ^{2} x\,dx$ $\qquad$ (2) $\displaystyle\int x 4^{x}\,dx$ $\qquad$ (3) $\displaystyle\int x \sin ^{-1} x\,dx$ (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14)