$\int\frac{23}{x^2\sqrt{x^2+100}}dx$
$x^2+15x+\frac{30}{4}$
$\int\:\:\csc\left(3x\right)\cot\left(3x\right)dx$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)-\tan\left(x\right)}{5x}\right)$
$3+4\left(16-2\cdot4\right)$
$x^2-3x=2$
$7-\left(-9\right)-\left(6\right)$
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