If normal to the curve y = f(x) is parallel to x-axis, then correct statement is [RPET 2000]

\frac{d y}{d x} = 0

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\frac{d y}{d x} = 1

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\frac{d x}{d y} = 0

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None of these

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Solution

The correct option is B $\frac{d y}{d x} = 1$
$s i n x s i n 3 x = \frac{1}{2} [c o s 2 x - c o s 4 x] .$

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