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## Homework Statement

[itex]\int cos^{2}(bx)dx[/itex]

## Homework Equations

## The Attempt at a Solution

This integral popped up in my quantum mechanics class yesterday and I solved it through double substitution to get,

[itex]\frac{x}{2} + sin(bx) * \frac{1}{4b}[/itex].

My question is, someone in my class said there was an easier way to solve this that only took 2-3 lines. Does anyone here have any ideas on what that may be?