Question

Find valueof tan 15 degree using tan (A-B)
=tanA-tan B/1+tanA tanB

Answer 1

Answer:

use tan (45 - 30)

tan 45 - tan 30 / 1 + tan 45. tan30

tan 45 = 1 and tan 30 = 1/ root 3

1 - 1/root 3 / 1 + tan 45 . tan 30

-0.855