$\sqrt{\frac{\left[1 + \frac{\tan(20)}{\cot(65,5)}\right]}{\sin^2(65,5) - \frac{\tan(20) \cdot (1,4 + \cos(2 \cdot 65,5))}{2 \cdot \cot(65,5)}}}$
Mathbot Says...
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.