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If cosy=xcos(a+y) , with cosa!=+-1 , pro...

If `cosy=xcos(a+y)` , with `cosa!=+-1` , prove that `(dy)/(dx)=(cos^2(a+y))/(sina)` .

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To solve the problem, we start with the given equation: \[ \cos y = x \cos(a + y) \] We need to find \(\frac{dy}{dx}\). ...
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