Differentiate $y = cos (2 x - 5)$ with respect to $x$

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Solution

$y = cos (2 x - 5)$
$\frac{d y}{d x} = \frac{d (cos (2 x - 5))}{d x}$

$\Rightarrow \frac{d y}{d x} = - sin (2 x - 5) \frac{d}{d x} (2 x - 5)$

$∴ \frac{d y}{d x} = - 2 sin (2 x - 5)$

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