How to Simplify the Integral 1/(1-x^2y^2) Using Substitution?

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The forum discussion focuses on simplifying the integral of 1/(1-x^2y^2) with respect to x, specifically from 0 to 1. The substitution x = sin(a)/cos(b) and y = sin(b)/cos(a) is proposed, leading to a transformed integral from 0 to π/4 of cos^3(a)cos(b) / (cos(a+b)cos(a-b)) du. A participant questions the clarity of the integrand after substitution, suggesting an alternative substitution of x = sin(u)/y for further simplification.

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Integral 1/(1-x^2y^2) dx?
From 0 to 1

Where x = sina/cosb and y=sinb/cosa


Using substitution and changing the limits yields

Integral from 0 to pi/4 of cos^3(a)cos(b) / (cos(a+b)cos(a-b)) du

But how to go from here?
 
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i don't understand yuor integral, you appear to have a lost any dependent variable in the integrand?

i would just try the substitution x = sin(u)/y
 

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