$24.8\cdot\:3.14$
$2a\:+\:2b$
$\left(2m\:+\:9\right)\:\left(2m\:-\:9\right)$
$\lim_{x\to0}\left(\frac{8^x-4^x}{8x}\right)$
$\frac{d^2}{dx^2}\left(e^{x^4}\right)$
$\left(-3\right)^2-4\left(2\right)\left(-2\right)$
$\frac{x+1}{x-2}>2$
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