forgot how to integrate this (1 Viewer)

Drongoski

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Ordinary substitution method more straightforward.
 
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yanujw

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Alternatively, let x = tan(theta)^2
You'll end up with the integral of 2tan(theta)^2 with new boundaries pi/4 and 0. I've checked and this confirms Drongoski's answer.
 

Run hard@thehsc

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Alternatively, let x = tan(theta)^2
You'll end up with the integral of 2tan(theta)^2 with new boundaries pi/4 and 0. I've checked and this confirms Drongoski's answer.
Yh I used that and it works
 

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