$\left(1+y^2\right)\frac{d^2}{dx}\left(y\right)=0$

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

$\int\frac{2x^3+10x}{\left(x^2+1\right)^2}dx$

$\left(\frac{x^3}{15}\right)\left(x^3\right)$

$sqrt\left(x^2+ax\right)-sqrt\left(x^2+bx\right)$

$\frac { n } { n }$

$1-25a^2b^2$