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Equation of Tangent at a Point (x,y) in Terms of f'(x)

Equation of t...

Question

Equation of the normal to the curve x $^{2}$ = $4$ y which passes through the point $(1, 2)$ is $x + y = k$ then $k =$

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Solution

$\Rightarrow$ As the normal passes through $(1, 2),$

$\Rightarrow x + y = 3 = k$

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