$\int\frac{x\:\sin\left(\frac{x}{2}\right)}{x\cos\left(\frac{x}{2}\right)}dx$
$-15-\:\left(-35\right)$
$2x+y=90$
$\sec\left(x\right)^2-4\tan\left(x\right)=6$
$\frac{1}{5}\cdot\frac{\left(x-3\right)}{6}$
$a^2b^9-a^7b^6+a^4b^5$
$10x^2-5$
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