$48x^2-90x+192x-90$

$\left(3-5x+x^2\right)^3$

$\left(\frac{5}{6}m^3-\frac{2}{3}n^2\right)\left(\frac{5}{6}m^3+\frac{2}{3}n^2\right)$

$\left(m^{\left(3\right)}-4\right)\left(m^{\left(3\right)}-8\right)$

$\left(m^6+3\right)\left(m^4+1\right)$

$\left(5mn^2+3\right)^3$

$\frac{1}{1+\sina}+\frac{1}{1-\sina}=2\sin2$