$17-21.9$
$\left(-2\right)-\left(7\right)-\left(-12+\left(5\right)\right)$
$\int\frac{15x^2}{\left(x^2+1\right)\left(x+1\right)}dx$
$4x+5^2$
$cos\:\left(\pi\:\:\:-\:x\right)+\:sin\:\left(\frac{\pi\:\:\:\:}{2}+\:x\:\right)=\:0$
$\frac{3x}{4}+\frac{1}{2}<\frac{2x}{3}-\frac{1}{4}$
$\frac{2\sqrt{6}}{\sqrt{2}}$
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