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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....
     
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