$4x+5=2x\:+\:9$
$\left(b+7\right)\left(b+3\right)$
$-3x^2-9x$
$\lim_{n\to\infty}\left(\frac{2n+1}{n^2}\right)$
$0.5x^2+6x+10.01$
$\lim_{x\to4}\left(\frac{\sqrt[3]{x+4}-2}{2-\sqrt{2}}\right)$
$\frac{d}{dx}\left(\frac{x^2}{a^2}-\frac{b^2}{y^2}=5\right)$
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