$2x-9\le x+4$
$\frac{7x^5}{14x^3}$
$\int_0^{\infty}\left(\frac{4}{5\left(x^2+2x+2\right)}\right)dx$
$\sin\left(42.5\right)\sin\left(2.5\right)\cos\left(42.5\right)$
$-1\left(-x\:-3\right)^{2\:}-19$
$0,3\:+\:1,9\:-\:\:\:\:3,7$
$\int\frac{\left(x^3+x-1\right)}{\left(x^2+2\right)^3}dx$
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