$28m^4+40m^3+8$

$\frac{dy}{dx}\left(y-1\right)\left(1-2y\right)$

$\left(5m^2-2n\right)^3$

$\lim_{x\to-\infty}\left(7+\left(-\frac{6}{x}\right)\right)$

$\frac{25}{\sin\left(x\right)}=\frac{15}{\sin\left(30\right)}$

$2\cot^2\:=\:\frac{1}{sec+1}-\frac{1}{sec\:-1}$

$9\left(2m-5n+10\right)$