$12-\left(-2\right)+\left(-5\right)$
$\lim_{x\to+\infty}\left(\frac{4e^{3x}-3x^2}{e^x-x}\right)$
$\frac{d^2}{dx^2}\left(\frac{x^2-y^2}{x^2+y^2}\right)$
$\left(2a+5\right)\left(a+4\right)$
$3\left(x+1\right)^2\left(x-1\right)+3$
$4g\:+\:5g$
$\sqrt{3ab}.\sqrt[3]{2ab^2}$
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