Question

How do you evaluate sec (11pi)/3?

Answer 1

`sec (11pi/3) = 1/cos ((11pi)/3)`

Trig unit circle gives:

`cos ((11pi)/3) = cos ((5pi)/3 + 2pi) = cos (pi/3)`

Trig table gives `cos (pi/3) = 1/2`

Then, `sec [(11pi)/3] = 2.`