3.2 置換積分法

1.

(a) $ \displaystyle{-e^{2 - x}}$(b) $ \displaystyle{-\tan (1 - x)}$(c) $ \displaystyle{-{\sqrt{1 - {x^2}}}}$(d) $ \displaystyle{\sec(x)}$

(e) $ \displaystyle{- e^{\frac{1}{x}}}$(f) $ \displaystyle{\frac{2 {\sqrt{1 + 3 \tan (\theta)}}}{3}}$(g) $ \displaystyle{-2 x - 2 \cot (x)}$(h) $ \displaystyle{\frac{1}{2}(\log (x))^2}$

(i) $ \displaystyle{\tan^{-1} ({e^x})}$(j) $ \displaystyle{\frac{-\cos ({x^2})}{2}}$