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For any real number of x and y,cos x = c...

For any real number of x and y,`cos x = cos y`,prove that `x=2npi+-y` where `n in Z`

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OSWAAL PUBLICATION-SAMPLE PAPER 7-EXERCISE
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  3. For any real number of x and y,cos x = cos y,prove that x=2npi+-y whe...

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