Question

Find the exact value of tan22.5 using the half angle formula.

Answer 1

Tan(a/2) = sin a / (1 + cos a)
tan(45/2) = sin(45) / (1 + cos(45)) = (1/√2) / (1 + 1/√2) = (1/√2) / (√2 + 1)/√2  = 1/(√2 + 1) = (√2 - 1)

Answer 2

Answer:

C on Edge

Step-by-step explanation:

I got it right on the test