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: 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


    User Avatar
    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


    User Avatar
    Homework Helper

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

  5. May 11, 2013 #4


    User Avatar
    Homework Helper

    Your answer (sin α) is correct.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted