$cos\left(x+z\right)-cos\left(x-z\right)$
$4\cdot\cos\left(x+\frac{4\pi\:}{45}\right)+6\cdot\sin\left(x+\frac{5\pi\:\:}{36}\right)$
$2x-1<3+4x$
$3\cos^2\left(x\right)-\cos\left(x\right)-2=0$
$-2-7x+2x+7$
$106+948+-125+-335$
$-4n^2m^5-4n^2m^5$
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