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" Prove that : "(a)2cos^(-1)(3)/(sqrt(13...

" Prove that : "(a)2cos^(-1)(3)/(sqrt(13))+cot^(-1)(16)/(63)+(1)/(2)cos^(-1)(7)/(25)=pi

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Find the value of 2cos^(-1)(3)/(sqrt(13))+cot^(-1)(16)/(63)+(1)/(2)cos^(-1)(7)/(25)

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