$2\sec=-1$
$\lim_{x\to0}\left(\frac{8x\left(\cos\left(3x\right)-2\right)}{\sin\left(4x\right)-4x}\right)$
$xy+4y=x^{-3}e^x$
$cos\left(x\right)\frac{\sqrt{3}}{2}$
$\left(16\right)\left(-14\right)\left(17\right)$
$z=4x-5y^2$
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