$\int4x^{-1}dx$
$\lim_{x\to-2}\left(x-9\right)$
$\frac{\left(s-3\right)}{\left(s-\sqrt{3}\right)\left(s+\sqrt{3}\right)}$
$\csc\left(-x\right)$
$\frac{-4}{x+5}\ge1$
$x^2+6x-4=0$
$\:\left(21m\right)^3\:n-7m^2\:n^2-14mn$
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