$\left(\frac{7}{6}m-\frac{2}{7}m^3n^4\right)\left(\frac{7}{6}m+\frac{2}{7}m^3n^4\right)$
$+6a+12a$
$y=\left(1+ce^{-x}\right)^{-1}$
$\frac { d y } { d x } = x e ^ { y }$
$3^{x^2}+2y=1$
$\frac{x^4-9x^2-5}{x-2}$
$a^2+8a+7$
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