$2\csc^2x+cotx=5$
$3\cdot x\:-\:4\:\ge\:x\:+\:4$
$\lim_{x\to+\infty\:}\left(\frac{-2x^5-1}{3x+x^2-x}\right)$
$3a-4-9a+5$
$\left(3x-2x^4\right)^3$
$\frac{\left(12x^3\right)}{\left(4x^3\right)}$
$\lim_{x\to0}\left(4x^3\sin\left(\frac{1}{x^3}\right)\right)$
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