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Prove that cos^−1 4/5+cos^−1 12/13=cos^−1 33/65

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asked Jan 15, 2018 in Mathematics by sforrest072 (157,439 points)
edited Mar 6, 2018 by faiz

Prove that cos⁻¹4/5+cos⁻¹12/13=cos⁻¹33/65

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answered Jan 15, 2018 by mdsamim (213,225 points)
selected Jan 15, 2018 by sforrest072

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Prove that cos^−1 4/5+cos^−1 12/13=cos^−1 33/65

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