$\lim_{x\to1}\left[\frac{x-1}{\sqrt{x}-1}\right]$
$9x^2-12x+9$
$3x^2y-10x^2y-4xy$
$\int_0^{\frac{1}{4}}\left(9\sin\:\left(2\pi\:x\right)^4\right)dx$
$6\cdot7+8-9$
$m^4+m^3n^2-mn$
$-\left(1+x\right)=-y^3\frac{dx}{dy}$
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