$\csc^2\left(2x\right)-\frac{1}{4x^2}$
$\frac{x+3\left(x+4\right)}{4}<\:2\left(x+1\right)$
$\infty-\infty-17$
$-2y^2\left(x-y\right)$
$tanxcscx-tanx-cotx$
$\left(\frac{1}{2}a^3+3\right)\left(\frac{1}{2}a^3-3\right)$
$\lim_{x\to+\infty}\left(\frac{1-x^2}{x^4+1}\right)$
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