$\left(\frac{a}{b}-\frac{b}{2}\right)^2$
$-4\cdot0\cdot500$
$\lim_{x\to1}\left(\frac{sin\left(1-x^2\right)}{x-1}\right)$
$1+7k+k+6$
$\left(\frac{9}{2}x+\frac{1}{2}\right)^3$
$x<4\left(x+2\right)+1$
$\frac{2}{\sin x}+10=6$
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