$2x\:-\:6\:+\:7x\:+\:8$
$a^2+8+16$
$\lim_{x\to-\infty}\left(\sqrt{4x^2+5x+6}-\sqrt{4x^2+x+3}\right)$
$\left(3x\:+7\right)\left(x-5\right)^2$
$5a^3b^2-8a^2b^3+3ab^4$
$\lim_{x\to\frac{\pi}{4}}\left(\sqrt{1+\sin\left(\frac{\pi}{2}\tan\left(x\right)\right)}\right)$
$cos\:x\:sec\:x-\frac{sec\:x}{cos\:x\:}$
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