$16=b^2$
$\frac{x-91}{\sqrt{x}-\sqrt{91}}$
$-6\:x\:2\:-17$
$\left(\sqrt{2x^2+3}\right)^2$
$\frac{3x^2}{x+1}-1=0$
$\int\tan^2\left(2x\right)+\sin\left(2x\right)dx$
$\int\left(x+2a\left(x+3b\right)\right)dx$
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