$\frac{sin^2x-cos^2x}{sec^2x}$
$\left(5x+\frac{1}{11}\right)\left(5x-\frac{1}{11}\right)$
$-18\:\:\left(-8\:-\:24\right)\::\:2$
$13a+13a-12b-11a-4b-b$
$\lim_{x\to\infty}\left(\frac{2-3x}{x+\sin\left(x\right)}\right)$
$x^2+2x=24$
$2\left(3+1\right)+8\left(5-2\right)$
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