find dy/dx if x2+xy+y2
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it will come 2x+y....... ..
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2x+y+x(dy/dx)+2y(dy/dx)
or dy/dx[x+2y]=2x+y
or dy/dx=(2x+y)/(x+2y)
or dy/dx[x+2y]=2x+y
or dy/dx=(2x+y)/(x+2y)
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