$\log_{12}\left(1\right)$
$16m^2-9n^2$
$\pi xy=100$
$49m^2-28m+4$
$2xy\:dy+\left(x^2+y^2\right)dx=0$
$\frac{\left(sec^2\left(x\right)-1\right)}{tan\left(x\right)}$
$7x^4+2x^2-9$
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