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Prove that cos^(-1).(4)/(5) + cos^(-1).(...

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

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

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Prove that cos^(-1)((4)/(5))=tan^(-1)((3)/(4))

Prove that sin^(-1). 3/5 +cos^(-1) . 12/13 = sin^(-1). 56/65

Prove that sin^(-1)((4)/(5))+tan^(-1)((5)/(12))+cos^(-1)((63)/(65))=(pi)/(2)

cos^(-1)((3)/(5))+cos^(-1)((4)/(5))=