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Tangent is given by 
  \frac{d}{dx} y^{2} = \frac{d}{dx} 12x

2y \frac{dy}{dx}=12
 \frac{dy}{dx}= \frac{6}{y}
but acc to the point(1,6)

Slope is 3/2

therefore eqn of line is y-4=3/2 (x-1)
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