tana=√ 2/2
(2sina+cosa)/(2sina-cosa)
=(2sina/cosa+1)/(2sina/cosa-1)
=(2tana+1)/(2tana-1)
=(2*√ 2/2+1)/(2*√ 2/2-1)
=(√ 2+1)/(√ 2-1)
=3+2√ 2.