$\frac{1}{\cos\left(x\right)}+\frac{-\sin\left(x\right)\cdot\sin\left(x\right)}{\cos\left(x\right)}=\cos\left(x\right)$
$\frac{\left(3x+5\right)}{x+2}+\frac{\left(2x-3\right)}{x+7}$
$w^2+3w+1.5$
$9+4^2$
$\left(a^b\right)^c$
$x+2x^2+x^3$
$\left(2x^{2a-3}-3y^{4a+1}\right)^2$
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