$\left(-124\right)+\left(+479\right)$
$12-3x=24$
$cos\left(x+z\right)-cos\left(x-z\right)$
$200-800$
$\frac{x^2-\sqrt{\:8x}}{\sqrt{2x\:}-2}$
$\int\frac{x-1}{x^3\left(x+1\right)}dx$
$3x^4+20x^3+28x^2+16x+5$
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