To obtain the graph of y = - sinx from the graph of y = sinx, phase shift required is

\frac{π}{2}

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π

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\frac{3 π}{2}

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2 π

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Solution

The correct option is B $π$
We know that
$sin (π + x) = - sin x$
Hence, a horizontal shift of $π$ in the $sin x$ graph will result in $y = - sin x$ graph.

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