$-\left(-4-\left(-2\right)+\left(2\right)\right)+5$
$\lim_{x\to\pi}\left(\frac{sinxcosx}{x^2-\pi\:^2}\right)$
$\lim_{x\to0}\left(\left(1-6x\right)^{\frac{3}{x}}\right)$
$\left(\left(\left(2\right)^{\left(-8\right)}\:\right)^{\left(-3\right)}\right)^{\left(-7\right)}$
$\lim_{x\to3}\left(\frac{x}{x^3-9x}\right)$
$5x^{2}+4x^{2}-y-6y+3$
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