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Math Help - help needed with trigonometric identities

  1. #1
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    help needed with trigonometric identities

    On the wikipedia page: List of trigonometric identities - Wikipedia, the free encyclopedia

    the following table can be read:"
    Symmetry

    When the trigonometric functions are reflected from certain angles, the result is often one of the other trigonometric functions. This leads to the following identities:"
    The table underneath says: Reflected in Theta=0, Reflected in Theta= pi/4, Reflected in Theta= pi/2.

    I can't make head or tails of this. What I do know is that it can somehow be drawn in the unitcircle. That it can be made visible.

    I can of course learn what is in the tables by heart, but I know I will quickly loose that information. I want to really understand it.

    I hope some of you can clarify this for me. Thanks beforehand.
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  2. #2
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    Re: help needed with trigonometric identities

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