# How do I find the derivative of y=sin(2x) - 2sin(x)?

$\frac{\mathrm{dy}}{\mathrm{dx}} = 2 \cos \left(2 x\right) - 2 \cos \left(x\right)$
$y = \sin \left(2 x\right) - 2 \sin \left(x\right)$
$\frac{\mathrm{dy}}{\mathrm{dx}} = 2 \cos \left(2 x\right) - 2 \cos \left(x\right)$