Question 606196
This is just a quadratic with a twist. (I will help you get started, however you will have to try it yourself to get the answer) 
Instead of x in our polynomial we have tanx.  

We have dealt with solving for x in quadratics before (If you have been given this question- I hope you have- if not check out factoring/quadratic equations)

Instead of solving for x however you are solving for tanx

And finally, once you have solved for tanx, you have tools to solve for x (tan inverse, or perhaps a special triangle).   

Try it out and see if this puts you on the right track if you are still confused let me know:)