$-3x^2-x^2-2x^2$
$\frac{x^6e^x}{cos\:xsin\:x}$
$\left(5w+\frac{1}{2}\right)x\left(5w-\frac{1}{2}\right)$
$z=\frac{y}{x}$
$y=5+2sin\left(4x+2\right)$
$y^{2}-12y+1=0$
$\lim_{x\to-1}\left(\frac{2x^2-2}{x^2+2x+1}\right)$
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