$x^2-4-4$
$9te^{6t}e^{-3t}$
$\int\frac{3x^2}{\sqrt{x^2-4}}dx$
$\int_{0}^{\infty}d^{0}$
$5^9x\:5^3$
$\lim_{x\to-3}\left(\frac{x^2+5x+6}{x+4}\right)$
$\lim_{x\to3}\left(\frac{4x^2+12}{x^2+4x+3}\right)$
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