$y^2-49$
$50-810.5^2$
$-308\:+\:\left(-934\right)$
$2\left(7\right)+10$
$3\left(x-1\right)-2\left(1-x\right)$
$\frac{x^3-x^2+14x-24}{x^2+1}$
$-2sin^2x=-3sinx+1$
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