$\frac{168}{-8}$

$ylnydx+xdy=0\:,y\left(1\right)=1$

$\int\frac{x}{\left(16-x^2\right)^2}\:dx$

$\frac{4r}{\sqrt{3}}$

$\int_1^{e^x}ln\left(u^5\right)du$

$\sin^2\left(x\right)\tan^2\left(x\right)=\tan^2\left(x\right)$

$\int ( x ^ { 3 } - 5 x ) ^ { 5 } ( 3 x ^ { 2 } - 5 ) d x$