$\int\frac{x-12}{x^3-2x^2+x-2}dx$
$f\left(x\right)=\:e^{-x}\cdot\left(x+2\right)$
$\lim_{x\to0}\left(\frac{\sqrt{81+sinx}}{x}\right)$
$\cos\left(x-y\right)-\cos\left(x+y\right)=2\cdot\sin\left(x\right)\cdot\sin\left(y\right)$
$2x-5^2\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\left(\frac{5}{20}\right)^{-1}a^8b^2$
$\frac{x^2-4x-21}{x-7}$
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