$\lim_{x\to0}\left(\frac{3sinx}{\sqrt{-x}}\right)$
$\left(-2\right)^3\left(-2^{-3}\right)$
$\left(3e+f\right)\left(3e-f\right)$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{senx}{cosx}\right)^{cosx}$
$\left(-6+4\right)-4+\left|3-\left(8+9-2\right)\right|$
$3\left(x+2\right)^2+2$
$-2\left(9w\right)-2\left(-3\right)-4\left(w\right)-4\left(-2\right)$
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