$\lim_{x\to\infty}\left(\frac{cos\left(20x\right)}{20x}\right)$
$\left(6xy\:+\:10\right)\:\left(6xy\:-\:10\right)$
$\left(6-2b\right)^2$
$\left(xy^2+x\right)dx-\left(x^2y-y\right)dy=0$
$\left(x^3+y^3\right)dx\:-\:3xy^2dy=0$
$-m^2x^3+m^3x^4-m^4x^3$
$x^2+18x-19$
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