$cos\:2x\:+\:cos\:x\:=\:0$
$y^2-14y\:+196$
$\tan^3\left(x\right)=3\tan\left(x\right)$
$16x^3-8y^3$
$\left(x+4\right)\left(x-4\right)+15=x+5$
$\left(2y+5\right)\left(2y-2\right)$
$\frac{dy}{dx}=-3y+x$
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