1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Check please sec (5pi/4)

  1. Jan 11, 2005 #1
    I converted the given into degrees first and got 225 degrees. Then I sketched this in a circle with cartesian planes and saw that the reference angle =45 degrees so I used the special triangle 45-90-45 Since sec=1/cos-> cos is negative in the 3rd quadrant so for this question when I evaluated I got my answer to be -square root 2 is this right?
  2. jcsd
  3. Jan 11, 2005 #2
    completly correct...
    good job....
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook