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## Homework Statement

Analyze the function f(x) = 2x + cotx over the interval [0,pi] and state the increases/decreases and concavity.

## Homework Equations

I already found the first and second derivatives. However, I'm having trouble when setting them equal to zero.

2 - csc2x = 0

and

2(cscx)^2(cotx)^2 = 0

## The Attempt at a Solution

2 - cscx^2 = 0

cscx^2 = 2

maybe 1/sinx^2 = 2

maybe (1/sinx)^2 = 2

and then I'm stuck...