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Homework Help: Trigomometric functions

  1. May 10, 2007 #1
    1. The problem statement, all variables and given/known data
    Find the exact value of each trig function:
    Sin 240º

    2. Relevant equations

    3. The attempt at a solution
    I am so lost here. I have no attempt. I am not asking you for the answer (i cant get answer without making an attempt which I don't have) i just need help. Please.
  2. jcsd
  3. May 10, 2007 #2
    Try to express 240 as sum or difference of angles for which you know the value of sinӨ like 360, 30, 60 etc.
    Last edited: May 10, 2007
  4. May 10, 2007 #3
    so 240 is 60 degrees more than the 180 line of quadrant 2 so sin 60 = √3/2. is that right or am i totally off?
  5. May 10, 2007 #4
    sin is -ve in 3rd and 4th quadrant
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