Question

integration of x tanx.tanx.secx.secx

Answer 1

Final Answer :
$\frac{x { (\tan(x)) }^{3} }{3} - \frac{ {( \tan(x) )}^{2} }{6} \\ + \frac{1}{3} ln( | \sin(x) | ) + c$
where c is constant of integration.

Understanding :
1) Integration by parts.
2) Integration Identities of some basis functions.

For Calculation see pic