1. Not finding help here? Sign up for a free 30min 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!

Exact values of sin(30) and cos(3pi/2)

  1. Sep 25, 2005 #1
    How can I work out exact values for trig functions like sin(30) and cos(3pi/2)?
  2. jcsd
  3. Sep 25, 2005 #2
    For simple expressions, use trigonometric/complex identities to reduce to terms you already know. For more complicated expressions, use series, ie., Taylor or Euler's expansions.
  4. Sep 25, 2005 #3
    Like the decimal values? Without a calculator?

    I would just draw out the triangle and leave the answer in the exact radical form, like in your first example. But [itex]\cos{\frac{3\pi}{2}}[/itex] is 0 so that should be easy.
  5. Sep 25, 2005 #4
    Ah thanks.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Exact values of sin(30) and cos(3pi/2)
  1. Sin/Cos In Equation (Replies: 3)

  2. What is cos and sin? (Replies: 7)