Question

find the value for tan pi/8

Answer 1

Step-by-step explanation:

its valu e2Ф = π/4  

    tan 2Ф = 1  = 2 tan Ф / [ 1 - tan² Ф ]

   1  - tan² Ф = 2 tan Ф

   tan² Ф + 2 tan Ф - 1 = 0

   tan Ф  =  1/2 [ -2 +- √(4 +4) ]  = -1 +- √2

   tan π/8 is > 0 So,  tan π/8 = √2 -1........please. mark as brainliest reply