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" 91."cos^(-1)[(x^(2)-y^(2))/(x^(2)+y^(2...

" 91."cos^(-1)[(x^(2)-y^(2))/(x^(2)+y^(2))]=tan^(-6)" Pravethat "(dy)/(dx)=(y)/(2)

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If cos^(-1)((x^(2)-y^(2))/(x^(2)+y^(2)))=tan^(-1)a, prove that (dy)/(dx)=(y)/(x)

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