$\left(5r+2t\right)^2$

$\int_{\frac{1}{3}}^{\frac{1}{2}}\left(\frac{1}{x^2}\right)dx$

$31y+13+30y$

$\left(2x-9\right)\left(3x^2-x+8\right)\:$

$4\left(\frac{1}{2}\right)\sqrt{12}\left(2\right)\left(3\right)^3$

$x\ln\left(x\right)y'+y=3x^3$

$\lim\:_{x\to\:0}\left(\frac{ln\left(x^2+2x\right)}{lnx}\right)dx$