cherrilyn 5 years ago PRove the following for a>0:

1. cherrilyn

$\int\limits_{?}^{?}dx/(x ^{2}+a)^{2} = 1/2a((x/x ^{2}+a) + (1/\sqrt{a})\tan^{-1} x/\sqrt{a})$

2. anonymous

it can be solved by substituting x=tanu

3. cherrilyn

really? if I used $x=atan \theta$ dx = $a \sec ^{2}\theta d \theta$