# Math Help - Integration by Substitution Help

1. ## Integration by Substitution Help

Let .
(a) Evaluate the integral by making a change of variables using hyperbolic functions. Hence evaluate

(b) Express in terms of exponentials. Solve for and hence express as .

2. Originally Posted by chav86
Let .
(a) Evaluate the integral by making a change of variables using hyperbolic functions. Hence evaluate

(b) Express in terms of exponentials. Solve for and hence express as .
Please show what you've done so far and where you get stuck.