$144m^2-400n^8$

$x-2\left(-3x^3+4x^2+6x+1\right)$

$\:\int\frac{3\cos^3\left(x\right)-4\sin^3\left(x\right)}{\sin^2\left(x\right)\cos^2\left(x\right)}dx$

$\lim\:_{x\to\:-0.6}\left(\frac{\left(x^3+x^2\right)-0.144}{x-\left(-0.6\right)}\right)$

$\int\frac{\sin^2x}{\cos^4x}dx$

$-7x^2y^4\left(12x^3y\right)$