$\frac{9m^2n}{-4mn^2}$

$\ln\left(x^{10}\right)-\ln\left(x^3\right)=7$

$\lim_{x\to-1}\left(\frac{x^2+3x+2}{x^2+5x+6}\right)$

$\int_0^2\left(\frac{1}{2}x^2e^{-x}\right)dx$

$\int3^{\sqrt{2x-3}}dx$

$\int_0^1\left(\frac{\left(1-cosx\right)}{x^2}\right)dx$

$x+\sqrt{2x+1}=7$