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5.3 Change of variables

1.

(a) $\displaystyle{8\pi}$ (b) $\displaystyle{\frac{3\pi}{4}}$ (c) $\displaystyle{\frac{\pi}{8}}$ (d) $\displaystyle{\frac{1}{2}}$ (e) $\displaystyle{\frac{8\pi}{3}}$

2.

(a) $\displaystyle{\frac{1}{2}}$ (b) $\displaystyle{\frac{1}{3}}$