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

Prove that : `cos^-1(12/13) + sin^-1(3/5) = cos^-1(33/65)`

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

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Prove that : cos^-1 (8/17) - cos^-1 (3/5) = cos^-1 (84/85)

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Prove that : sin^-1(4/5) + sin^-1 (5/13) = cos^-1 (16/25)

Prove that : sin^-1 (3/5) - sin^-1 (8/17) = cos^-1(84/85)

Prove that cos^(-1)(12/13)+sin^(-1)(4/5)=tan^(-1)(63/16) .