$\lim_{x\to\infty}\left(\frac{2x}{x+1}\right)$
$-\frac{0.1}{-15}$
$-12<x-7$
$\frac{1}{cos^4x}-\frac{1}{cos^2x}$
$6\left(u+4\right)$
$\left(\sin\left(x\right)+\cos\left(x\right)\right)\cdot\tan\left(x\right)-\sec\left(x\right)$
$20+90+514$
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