$\frac{y^{6\:}}{y^{4\:}}$

$2x+5<6$

$6x^2+x+15$

$\left(\frac{2}{3}a^2+\frac{3}{5}ab-\frac{5}{2}b^2\right)\left(-\frac{2}{7}ab\right)$

$\lim_{x\to-1}\left(\frac{x^2+6x+5}{x+1}\right)$

$\sqrt[3]{a^5}$

$\frac{3\left(x+m\right)^2-\cos\left(x+m\right)^2-3x^2-\cos\left(x^2\right)}{m}$