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∫√tan(θ)dθ

His hints were first use the substitution u=tan(θ) then use the substitution u=x^2

I then had 2∫(x^2dx)/(sec^2(θ)

I let x=tan(θ) so that dx=sec^2(θ)dθ

And then got 2∫tan^2(θ)dθ

which I got as 2tan(θ)-2θ+C, and d/dx of that is not √tan(θ)

Any thoughts?

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