$\lim_{x\to2}\frac{\left(x^2+x-6\right)}{x-2}$
$19\:\:-\:\:\left(-15\right)\:\:$
$\int\left(\frac{x}{\sqrt{20+8x-x^2}}\right)dx$
$\frac{2}{\cos^2\left(x\right)}-2$
$2x+5\ge1$
$6udz-uzdu=3zdu-uz^7dz$
$\frac{e^x}{e^{-2x}}$
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