$\frac{cos^4x-cos^2x}{sec\:x}$
$\left(3x\right)\left(2x-6\right)$
$\left(a+b\right)^2-2\left(a+b\right)c+c^2$
$\int\frac{lnx}{\sqrt[2]{x}}dx$
$\lim_{n\to\infty}\:\left(-2\right)^n+1$
$\frac{x^2-16}{x+44}$
$sen\:20^{\circ}.\:csec\:20^{\circ}\:=1$
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