Problem $2$

By making use of the substitution $x=tan$ rewrite the integral ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{1}{(x^{2}1{)}^{\frac{3}{2}}}dx$ in terms of onl $$ and $d.$ Simplify the integrand, do not evaluate.

Problem $3$

Find the value of $B$ in the expression: $\frac{5x-10}{x^2-3x-4}=\frac{A}{x-4}\frac{B}{x1}$

$($a$)-3$

$($b$)-1$

$($c$)2$