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" 25."cos^(-1)(15)/(17)+cos^(-1)(3)/(5)=...

" 25."cos^(-1)(15)/(17)+cos^(-1)(3)/(5)=cos^(-1)(13)/(85)

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cos^(-1)(8/17)-cos^(-1)(5/13)=

Prove that sin^(-1)((8)/(17)) +sin^(-1)((3)/(5)) =cos^(-1)((36)/(85)) .

Prove that sin^(-1)((8)/(17))+sin^(-1)((3)/(5))=cos^(-1)((36)/(85))

Cos^(-1)(3/5)+Cos^(-1)(12/13)=

cos^(-1)(15/17)+2 tan^(-1)(1/5)=

cos^(-1)(15/17)+2 tan^(-1)(1/5)=

cos^(-1)(15/17)+2 tan^(-1)(1/5)=

Prove that cos^(-1)((3)/(5))+cos^(-1)((12)/(13))+cos^(-1)((63)/(65))=(pi)/(2)

Prove that : cos^(-1).(3)/(5)+ cos^(-1).(12)/(13) = sin^(-1)((12)/(5))

Prove that cos^(-1).(4)/(5) + cos^(-1).(12)/(13) = cos^(-1).(33)/(65)