Question

Find exact value of tan195 using half angle identities

Answer 1

tan(195) = tan(390) = tan(30)

Answer 2

\[\tan(30/2) = \sqrt{(\sin(30))/(1+\cos(30))}\]

Answer 3

wait... there is NO square root on the previous post.

Answer 4

tan(30/2) = (sin(30))/(1+cos(30))

Answer 5

which simplifies to 2-sqrt(3)