1. Evaluate the following antiderivatives, i.e., indefinite integrals. Show all working.
(a) \( \int \frac{3x^3}{(x^4+5)^{1/4}} dx \)
(b) \( \int \left( 8x^3 - 5x^{1/8} - \frac{1}{x^{2/3}} + \sin x \right) dx \)
(c) \( \int \frac{\cos(\sqrt{x})}{2\sqrt{x}} dx \)