$\frac{x^2-x-2}{x-1}$
$15+3^2-2\cdot7+\left(20-3\cdot4\right)$
$\sqrt{1.4142135623730951+\sqrt{5-7.348469228349534-1.4142135623730951+\sqrt{8+2\sqrt{12}}}}$
$\frac{1-\cos\left(x\right)}{\sin\left(x\right)}=-\csc\left(x\right)-\cot\left(x\right)$
$\left(6+9i\right)-\left(7-5i\right)$
$a^2-11a+45$
$\left(4x+6\right)\left(x-2\right)$
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