$-2x^2-3x+4$
$18x^2+13x-5$
$-2\left(x+y\right)^5$
$3\left(y+2\right)-5\left(x-4\right)$
$\lim_{x\to\frac{\pi}{6}}\left(\frac{sin\left(x-\frac{\pi}{6}\right)}{3-4cos^2\left(x\right)}\right)$
$-50+65-1.600$
$12y^2+6y^2+3y^2+10y^2-7y^2+y^2$
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