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

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