$sec\:=\:sqrt\left(7\right)$
$x-4=15$
$\left(2a^2+3b^2+ac^2\right)^2$
$\lim_{x\to1}\left(e^{\frac{1}{x^2+x-2}}\right)$
$x^2-15x+56$
$\lim_{n\to\infty}\left(\frac{10^9\:lg^2\:\:n}{n}\right)$
$2x^2+4x-2y+6=0$
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