$\int_6^9\left(3tan^{-1}x\right)dx$

$3\left(xy^2+5y^4\right)^2$

$-\frac{2}{3}y^2-\frac{5}{2}x^2+\frac{7}{3}y^2+\frac{1}{4}x^2$

$-8+\left(-5\right)x\:6$

$\left(2\right)\left(1\right)+1$

$\lim_{x\to0}\left(\left(\frac{1}{x}\right)ln\left(sqrt\left(\frac{1+x}{1-x}\right)\right)\right)$

$x^2-\frac{2}{3}x=0$