$\cos\left(a\right)=-2$
$\frac{d}{dx}\frac{e^{2x}}{\sqrt{x^2+x+1}}$
$\lim_{x\to2}\left(\frac{2x^2-6x\pi+4\pi^2}{x^2-\pi^2}\right)$
$10x^2-60x+9$
$5,776-\left(-8\right)$
$y'+6xy=14x,y\left(0\right)=1$
$\lim_{x\to-\infty}\left(\frac{\sqrt{x^2+x}}{x}\right)$
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