$\cos\left(2x\right)+\cos\left(4x\right)+2\cos\left(x\right)=0$
$5.5-3.31-2.19$
$9mn+18mn^2$
$5\left(-1\right)^7-4\left(-1\right)^2+11\left(-1\right)+17y$
$2y=6-x$
$\left(y+9\right)\:\:\left(y-5\right)$
$\left(m^4+4\right)^3$
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