$\left(\frac{a}{6}+\frac{x^3}{5}\right)\left(\frac{a}{6}-\frac{x^3}{5}\right)$

$\frac{6x^4+8x-4}{2x}$

$\frac{1+\sec\left(x\right)}{\tan\left(x\right)}=\cot\left(\frac{x}{2}\right)$

$\frac{-7.93}{-15.86}$

$\left(m^4+3\right)\left(m^4-3\right)$

$\frac{dy}{dx}=y^2+2xy+x^2+1$

$3n+20=4-m$