$2ib\:+\:63b^2$
$\lim_{x\to-2}\left(\frac{\left(x-1\right)^2}{x^2+2x}\right)$
$\frac{42}{18a+24b}$
$\frac{sec\:x\:sin\:x}{tan\:x+cot\:x}=sin^2x$
$e^{2x}=0$
$-2xz+xz-7xz+9xz$
$x-7<2x+1$
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