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June 1st, 2018, 03:25 AM  #1 
Newbie Joined: Mar 2018 From: Philippines Posts: 3 Thanks: 0  TrigonometricIdentity Problem (Quick Question)
Shouldn't the quadrant in the orange circle (or whatever it looks like) match with the quadrant in the green one (i.e., Quadrant I)? Thanks. Sent from my BLNL21 using Tapatalk 
June 1st, 2018, 06:09 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,636 Thanks: 2081 
Yes. It appears "in QI" should have been "in QIII".


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