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

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

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CENGAGE PUBLICATION-INVERSE TRIGONOMETRIC FUNCTIONS-All Questions
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  3. Prove that cos^(-1)4/5 + cos^(-1)(12)/(13)=cos^(-1)(33)/(65)

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