$\left(2x+3\right)\cdot\:\left(2x+10\right)$
$\lim_{x\to-\infty}xln\left(1-\frac{1}{x}\right)$
$\lim_{b\to2}\left(\frac{b^3-8}{b^2-4}\right)$
$\int\frac{4}{x\left(x^{2}-9\right)}dx$
$b\:+\:4\:+\:6b$
$7x<40$
$cos\left(2t\right)+sin\left(t\right)=1$
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