Hi, I am working on a great (and heavy) paper that relate to trigo, geometry, and algebra, and I got the following equation:

https://drive.google.com/file/d/0B3t...5GbXJieTA/view

It is an equation with 4 unknowns, and I do not need to solve it, I just need to know if it a false or true expression.

Can anybody give me a direction? I kind of tried everything, and it does not go pretty well for me by now.

Thanks!