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Prove that: tan^(-1)4/5+cos^(-1)(12)/(13...

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

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

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

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tan^(-1)((5)/(13))+cos^(-1)((3)/(5))=