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

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

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To solve the problem, we start with the given equation: \[ \cos y = x \cos(a + y) \] ### Step 1: Differentiate both sides with respect to \(x\) ...
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