$\lim_{x\to1}\:\frac{x^3+x-2}{x^3-x^2-x+1}$
$1-2\left(x+5\right)\ge-3$
$4y^2-18y+91$
$\frac{\sin^2\left(x\right)}{\sec\left(x\right)+1}$
$14\:<\:8x\:-\:2$
$9b^2-25b^2$
$-4x^2-0$
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