I.3.1.49 Indefinite Integrals

Condition: find uncertain integrals: a) \ (\ int 2 \ sin^{2} \ frac {x} {2} d x \) \ (\ int {x^{3} d x} {x^{8} -4} \) \ (\ int) \ (\ int) \ (\ int) \ (\ int) \ frac {e^{\ sqrt {x}} {\ sqrt {x}} d x \), g) \ (\ int x e^{-2 x} d x \).