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Homework Help: Identities homework problem

  1. Apr 8, 2008 #1
    1. The problem statement, all variables and given/known data
    I'm on the last section of identities entitled half angle identities. This one seems to give me some trouble because I have never encountered one with a horizontal shift in it. Tips?

    tan 1/2( ß + π/2 ) = ( 1 + sin ß ) / cos ß
  2. jcsd
  3. Apr 8, 2008 #2

    Tom Mattson

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    Recall that:


    Now, what do the graphs of the sine and cosine functions look like when you shift them to the left by [itex]\frac{\pi}{2}[/itex] rad?
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