$-6b^3+8a^3+4b^3-a^3$

$81m^4-m^2$

$\lim_{x\to\infty}\frac{5x^2+3x}{2x+1}$

$\left(1-cos^2\left(x\right)\right)\left(1+cos^2\left(x\right)\right)=1$

$\int\frac{3x+1}{\left(x^2+1\right)\left(x^2+4\right)}dx$

$y\:=\:\left(x^3\:+\:1\right)^5\left(x\:-\:1\right)^2x^4$

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