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Help with identities math problem?

  1. Jan 19, 2010 #1
    The question asks you to simplify sin(3pi/2+x).

    I know that you've got to use the sin(a+b)=sinacosb+cosasinb

    but I'm not sure how to solve it when it's not a special triangle.

    Any help is much appreciated.
  2. jcsd
  3. Jan 19, 2010 #2
    Nevermind, figured out my silly mistake.
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