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## Homework Statement

I have three problems that I'm having a hard time with. I'd appreciate any help with

any of the three problems.

[tex]\int((cos(x))^6)dx[/tex]

AND

[tex]\int(x^3 * sqrt(x^2 - 1)[/tex]

AND

Solve for y (separation of variables):

dy/dx = ((2y + 3)^2)/((4x + 5)^2)

## Homework Equations

Separation of variables for 3rd problem.

## The Attempt at a Solution

I have work on scartch paper but I get stuck.