$\frac{1}{3}ab-\frac{2}{1}ab$

$\frac{2^{3}\cdot5^{-7}\cdot7^{3}}{\left(-2\right)^{-4}\cdot5^{7}\cdot7^{3}}$

$\frac{10q^2}{p+q}+qe^{\frac{1}{p}}$

$\sec\left(o\right)=2$

$\lim_{x\to1}\frac{\ln\left(x\right)}{x^7+1}$

$-9\left(1-3m\right)$

$\frac{dy}{dx}=\frac{\left(y^2+y\right)}{\left(x+x^3\right)}$