Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\int_{0}^{\pi/2}\frac{dx}{(a^{2}\cos^{2}x+b^{2}\sin^{2}x)^{2}}=$$

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