$\frac{x^2+6x+12}{x-4}$
$\lim_{x\to2}\left(\frac{3-\sqrt{5x-1}}{x^2}\right)$
$\frac{dy}{dx}=\frac{cos4x}{sin6y}$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{\sec\left(2x\right)}{1-\tan\left(x\right)}\right)$
$5.5-0.75$
$\left(2x^2\:+y^2\right)^2$
$\sec^2a-1$
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