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: Signs of Trignometric Ratios.

  1. Sep 23, 2009 #1
    Identifying the signs of ratio in four quadrants. It turns out that -ive trignometric identity will be negative but not for cos and sec. But why?
     
  2. jcsd
  3. Sep 23, 2009 #2

    rock.freak667

    User Avatar
    Homework Helper

    if you mean why cos(-x)=cos(x)

    is because if you draw x clockwise,it lies in the 4th quadrant and where is cos(x) +ve?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...