Find the Anti$-$devivetives

c$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{1}{x^2+25}dx$

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

$3.$ Find the arre length of the graph of the function $y=\frac{1}{2}(\frac{1}{8}{x}^3+\frac{1}{x})$ over the interval $1,2$

$4.$ Find the surface area of revolution formed by revolving the function