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A trigonometry question

  1. May 11, 2013 #1
    1. The problem statement, all variables and given/known data
    If cot (α + β) = 0 then sin(α +2β) is
    the options are
    a. sin α b. cos α c. sin β d. cos 2β


    2. Relevant equations
    There is as such no equation


    3. The attempt at a solution
    I did try to solve it but I kept arriving at the wrong answer. The correct answer is c. sin β while the answer I keep getting is a. sin α
     
  2. jcsd
  3. May 11, 2013 #2

    CompuChip

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    Science Advisor
    Homework Helper

    Maybe you can show us what you have so far, and we can try to find the error.
     
  4. May 11, 2013 #3

    ehild

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    Gold Member

    Are you sure that c) is the correct answer? Try with α=60° and β=30°. I think your result is the correct one.

    ehild
     
  5. May 11, 2013 #4

    Curious3141

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    Homework Helper

    Your answer (sin α) is correct.
     
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