i.3.1.49 Indefinite integrals

condition: Find the indefinite integrals: a) \( \int 2 \sin ^{2} \frac{x}{2} d x \) b) \( \int \frac{x^{3} d x}{x^{8}-4} \) B) \( \int \frac{e^{\sqrt{x}}}{\sqrt{x}} d x \), d) \( \int x e^{-2 x} d x \).