$\frac{2}{5}\cdot\left(\frac{1}{5}\right)^{-1}+\left(\frac{3}{2}\right)^{-2}\cdot\left(2-5\right)$

$\left(x^2+y^2-xy\right)\left(x^2-y^2+xy\right)$

$\left(5x^2-7x+12\right)^2$

$\frac{x^2-15x+25}{x+5}$

$sec=-\frac{11}{6}$

$\int\frac{x+2}{2x^2+2x-12}dx$

$\left(4y-8\right)\left(4y+8\right)$