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" 31."[" If "x=e^(cos2t)" and "y=e^(sin2...

" 31."[" If "x=e^(cos2t)" and "y=e^(sin2t)," then prove that "(dy)/(dx)=-(y log x)/(x log y)],[" यदि "x=e^(cos2t)" and और "y=e^(sin2t)," तो सिद्ध करो कि "]

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