If the curves and cut orthogonally

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

If the curves

x=y^2

and

xy=k

cut orthogonally, then

k

is (a)

1

(b)

-1

(c)

\pm\frac{1}{2\sqrt{2}}

(d)

\pm\frac{1}{\sqrt{2}}

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