The value of the integral int0^(pi/4) dx...

The value of the integral `int_0^(pi/4) dx/(a^2cos^2x+b^2sin^2x) ` (A) ` 1/(ab)tan^-1(b/a)(a,bgt0)` (B) `1/(ab)tan^-1(b/a)(a,blt0)` (C) `pi/4(a=1,b=1)` (D) none of these

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