$18x^2+17x-15$
$\lim_{x\to0}\:\frac{1-tanx}{1-senx}$
$\left(-2+5x^2\right)^2$
$\frac{d}{dx}\sin\frac{1}{2}x$
$sec\:\left(x\right)^2\:-\:cos\:\left(x\right)^2\left(sec\left(x\right)^2\right)$
$x^4-3x^3+2x$
$2x-3-x+8$
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