(x2-y2) =4xy find dy/dx
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=>x^2-y^2=4xy
then derivative of this will be
2x-2ydy/dx=4(y+xdy/dx)
2x-4y=(2y+4x)dy/dx
x-2y/y+2x=dy/dx
then derivative of this will be
2x-2ydy/dx=4(y+xdy/dx)
2x-4y=(2y+4x)dy/dx
x-2y/y+2x=dy/dx
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