$169m^2+26m+1$

$\left(\left(a^3-a\right)+\left(a^2-3\right)\right)\left(\left(a^3-a\right)-\left(a^2-3\right)\right)$

$x+14+x+9+5x-10$

$x^2+30x-300$

$d\left(\frac{-1}{\left(n-1\right)\left(xy\right)^{n-1}}\right)$

$\lim_{z\to i}\left(\frac{z^2-2iz-1}{z^4+2z^2+1}\right)$

$70\cdot70$