Question

Вычислите если ,

Answer 1

 $ctga=\frac{cosa}{sina}=1\\\\ cosa=sina \\\\ 2(1-sin^2a)=1\\\\ sin^2a=\frac{1}{2}\\\\ sina=\frac{\sqrt{2}}{2}\\\\ 2*\frac{1}{2} + \sqrt{2}*\frac{\sqrt{2}}{2}+1=3$