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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(12/13) + sin-1(3/5) = sin-1(56/65)

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Given cos-1(12/13) + sin-193/50 = sin-1(56/65)

Let cos-1(12/13) = x ⇒ cosx = 12/13

= sin-1(20/65 + 36/65) = sin-1(56/65) = RHS

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