$15\tan^2a+14\tan a-8$
$\lim_{x\to0}\left(\frac{3}{x^4}-\frac{1}{x^2}\right)$
$-13+9\cdot4-17\cdot0-7$
$3x\:-\:2y^2p\:x\:5$
$\frac{x^2-5x+2}{x+1}$
$\frac{d}{dx}\left(2x^{\left(\sqrt{x}\right)}\right)$
$12x^3+18x^2-10x$
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