$18+x=27$
$5\cdot\left(10+3\cdot3+48+6-7\right)$
$15-\left|10-\left(8-4\right)\right|$
$\lim_{x\to0}\frac{\arctan\left(5x\right)}{\ln\left(x\right)}$
$\int\frac{\sec^2\left(x\right)}{1+9tan^2x}dx$
$s^2+s+2$
$\left(x\:^3+7\right)\left(x^3-7\right)$
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