Question

What is the value of a in the equation 2 cos a = 1?

Answer 1

a = pi / 3
or
a = 5pi / 3

Answer 2

lazbumtac how did you get that??

Answer 3

Haha I have the unit circle memorized in my head

Answer 4

If you look at a unit circle, then cos(pi /3) = 1/2. Then (1/2) * 2 = 1. cos(5pi /3) is also = 1/2

Answer 5

thank you!