$\lim_{x\to0}\left(\frac{3sin\left(x\right)}{cos\left(x\right)-1}\right)$
$\frac{x^6-x^6}{x+x}$
$x+4-5x-2$
$- 1 - [ - 3 - 2 + ( - 4 ) ]$
$n^2+3n=10$
$-9c-8c$
$\frac{dy}{dx}=100\left(y^2+4\right)$
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