How do you find the derivative of $cos(2x+3)$ ?

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Answer 1 · 2015-12-23T22:11:30

$-2sin(2x+3)$

The way to do this is by using the chain rule.
The derivative of $cos(x)$ is $-sin(x)$ :
$d/dxcos(2x+3)=-sin(2x+3)*d/dx(2x+3)$

The derivative of $2x+3$ is $2$ , so the full derivative becomes:
$d/dxcos(2x+3)=-2*sin(2x+3)$

How do you find the derivative of cos(2x+3)cos(2x+3)?