$2\cos\left(c\right)^2-1$
$18-6and-18+6$
$-51-\left(-60\right)$
$3\left(20+4\right)$
$\int\:\frac{3}{\sqrt{1-x^2}}dx$
$-5-\left(17-8\right)$
$-7x^4y+10x^4y$
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