Find the derivatives of the following functions at the indicated points.
$sin 2 x$ at $x = \frac{π}{2}$

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Solution

$y = sin 2 x$
$\frac{d y}{d x} = cos 2 x .2$
${\frac{d y}{d x}]}_{x = \frac{π}{2}} = 2 cos π = - 2$ .

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