$1234\:=nlo$
$\lim_{x\to0}\left(\frac{1-\cos\left(3x\right)}{\sin\left(4x\right)}\right)$
$-m^2n+6m^2n$
$\left(4x^3+1\right)^3$
$x^2+3=2x+y$
$\left(3x^m-2y^n-8z^2\right)^2$
$\lim_{x\to0}x^2+x-6$
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