$\lim_{x\to1}x^2+2x+4$
$18x^2=65x-7$
$\left(3+8i\right)\left(7-9i\right)$
$1\left(-1\right)-\left(-2\left(-1+\right)\right)\left(-4\right)$
$x\:^3-2x$
$3^{4\:}\cdot\:7^4$
$\int x\sqrt{x^2-12}dx$
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