問題：次の関数を積分せよ
- (1) \( \displaystyle \int_{-2}^{0} |x^2 - 2| dx \)
- (2) \( \displaystyle \int_{\frac{1}{2e}}^{\frac{e}{2}} |\log 2x| dx \)
- (3) \( \displaystyle \int_{0}^{3} |e^x - 3| dx \)
- (4) \( \displaystyle \int_{-\pi}^{\frac{\pi}{2}} |\cos^2 x\sin x| dx \)
- (5) \( \displaystyle \int_{0}^{3} \sqrt{9^x - 2 \cdot 3^{x + 2} + 81} dx \)