$5x^2+200x+750$
$\left(\sin\left(a\right)+\cos\left(a\right)\right)^2+\left(\sin\left(a\right)-\cos\left(a\right)\right)^2$
$\lim_{x\to-1}\left(\frac{\sqrt{x+3}-2}{\left(x+1\right)\left(x-1\right)}\right)$
$2y^2-16y$
$sinx=-\frac{2}{3}$
$2x-x^2=0$
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