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

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

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

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