$f\left(x\right)=x^{3}\ln xe^{x}$
$x^3:x^3$
$\left(\sqrt{2}x-\sqrt{2}\right)\left(\sqrt{2}x+\sqrt{2}\right)$
$\int\cos\left(at\right)\cos\left(bt\right)dt$
$5x^3-12x^2+9x-2$
$\lim_{x\to0}\left(\frac{6}{cosx-1}\right)$
$-12\:=\:-5a\:+\:2a$
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