$\int_x^{x^2}\left(t+1\right)^3dx$

$3x^2-3x<\:2x^2+4$

$\frac{1}{1+\cos\left(x\right)}-\frac{1}{1-cos\left(x\right)}$

$r^{15}+216w^6$

$e=x^{3}+\frac{1}{x^{3}}\quad\text{si}\quad\frac{1}{x}+x=4$

$2x\:+\:2y\:+\:x^2\:-\:x\:+\:x^2$

$\left(4m^2-5\right)\left(4m^2-8\right)$