$\lim_{x\to4}\left(\frac{x^2-4x}{x^216}\right)$
$\left(2x-1\right)^2-\left(x+1\right)\left(x-2\right)\le5$
$3\cdot\left(1+\csca\right)\left(1-csca\right)=-\cota$
$x^2-5x-36=0$
$\int\sqrt{2.25-x^2}dx$
$a^2-6a-16$
$4+9+18$
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