定積分の置換積分法①

問題次の定積分を求めよ。$${\small (1)}~\int_{-2}^{0}x\sqrt{x+2}dx$$$${\small (2)}~\int_{{\large \frac{\pi}{2}}}^{\pi}\sin^2{x}\cos{x}dx$$$${\small (3)}~\int_{1}^{e}\frac{(\log x)^2}{x}dx$$