Find the indefinite integrals.

a$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}2x\sqrt[\phantom{2}]{5x+6}dx$

b$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}cos{h}^7(2x)sinh(2x)dx$

c$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{\sqrt[\phantom{2}]{4+x^2}}$

d$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x^3-3x^2+5}{x-3}dx$

e$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x}{\sqrt[\phantom{2}]{1-x^4}}dx$

f$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{\sqrt[\phantom{2}]{x}+5}{x^2}dx$

g$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{3x+5}{\sqrt[\phantom{2}]{1-x^2}}dx$