$\frac{cos\left(5x\right)-cos\left(13x\right)}{2}$
$\left(a^2+4\right)\left(a-2\right)\left(a+2\right)$
$-7x+2y=18$
$\left(6a+b\right)\left(6a-b\right)$
$5\tan\left(x\right)+1=6$
$\left(-6m^6x+4n^4y\right)^2$
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