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" 10.If "f(theta)=int(0)^(oo)(tan^(-1)x)...

" 10.If "f(theta)=int_(0)^(oo)(tan^(-1)x)/(x^(2)+2x cos theta+1)dx,theta in(0,pi)," then "f((pi)/(2))=(pi^(2))/(a)," where a is "

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