Find the following indefinite integrals:

a$)$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{1}{e^{2x}}dx$

c$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}10cos5xdx$

b$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{1}{3x}dx$

d$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}4sin3xdx$