$\cos^{-1}\left(\frac{3.7}{5.4}\right)$
$n^2-6n-40=0$
$.01\left(5x+6\right)^2$
$x^3-x^2-x+1$
$\left(2x-3y\right)\left(2+3y\right)$
$\left(3+x\right)\frac{dy}{dx}=4+x$
$\lim_{n\to\infty}\:1+\left(-2\right)^{2n}$
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