$997x+3^{\frac{1}{3}}\:at\:x=1$
$4ab+4ab+b^2=0$
$18-2x>4$
$-20\cdot15+-15\cdot5$
$\lim_{x\to\infty}\left(\frac{\sin\left(4x\right)}{\sin\left(3x\right)}\right)$
$\cos\left(30\right)^2$
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