(1+tana)/(1-tana)=2
tana=1/3
sin2α+sin^2α+cos2α
=(2sinacosa+sinasina+cosacosa-sinasina)/(cosacosa)
=2tana+tanatana+1-tanatana
=2tana+1
=5/3
(1+tana)/(1-tana)=2
tana=1/3
sin2α+sin^2α+cos2α
=(2sinacosa+sinasina+cosacosa-sinasina)/(cosacosa)
=2tana+tanatana+1-tanatana
=2tana+1
=5/3