$\lim_{x\to\frac{\pi}{4}}\left(\frac{1-\tan\left(x\right)}{\cos\left(2x\right)}\right)$
$.5^3$
$\frac{12x^2-18x}{3x}$
$+14-\left(-220\right)$
$\lim_{y\to-2}\left(2y^2+5y-y\right)$
$\frac{24x^8-24x^2+46x-20}{4x-2}$
$\int\frac{4x}{\sqrt{x^2-64}}dx$
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