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(o)) (55R Didign By |
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Answer» 2tan^-1a=cos^-1(1-a^2/1+a^2)Now cos^-1(1-a^2/1+a^2)+cos^-1(1-b^2/1+b^2)=2tan^-1x2tan^-1a+2tan^-1b=2tan^-1xhencex=a+b/1-abHence proved |
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