$\left(y+2z\right)\left(y-2z\right)$
$\int\frac{-19x^{2}+50x-25}{x^{2}\left(3x-5\right)}dx$
$\frac{\left(4x^2+3x\right)}{x^2-6x+8}\le4$
$\lim_{x\to0}\left(\frac{sinx}{sqrt\left(1-cosx\right)}\right)$
$-2.8+3-6.9-29.4+30.2$
$-\frac{3x}{x^4}$
$\ln\left(15a\right)$
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