$\lim_{x\to0}\left(\frac{\sqrt{x}}{\sin\left(x\right)}\right)$
$c\left(7x-1\right)$
$-1250-398$
$-3\:\left(-10\right)$
$\frac{27x^{-9}}{18x^{-3}}$
$25-4x^6$
$\cos\left(x\right)-\cos\left(2x\right)=1$
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