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The equation of normal to the curve y=2x...

The equation of normal to the curve `y=2x^(3)-x^(2)+2` at `((1)/(2),2)` is
a) `2x-4y+7=0`
b) `2x+y-3=0`
c) `x+y=0`
d).`2x-y+3=0`

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