$\ln x^2+3\ln y$

$cos\left(45\right)=\frac{a}{60}$

$-\left(-6+8-8+9\right)+\left(-5+8-7-1+3\right)-8+3$

$\int\frac{1}{\left(9-\left(x+2\right)^2\right)^{\frac{3}{2}}}dx$

$\int\frac{x}{\left(x^2+7\right)^2}dx$

$\int\frac{2x^2+1}{\left(x-3\right)^2}dx$

$\frac{8x^3-43x^2-25x-30}{x-4}$