$n^2+5n+10;\:n=10$
$20+90+519$
$\lim_{x\to0.785}\left(\frac{sec^2x-2\tan\left(x\right)}{1+cos\left(4x\right)}\right)$
$\sqrt{18x^2y^3}$
$-455+-934$
$\lim_{x\to\infty}\frac{\cos\sqrt{x}-\cos x}{1-\cos\sqrt{x}}$
$x^2+3x+4x-2x^2+5+3x^2+5x-7$
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