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Math Help - Strange Notation - Please Help!

  1. #1
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    Strange Notation - Please Help!




    Does someone know what this notation means? It is in the context of one period of a trigonometric function (when a function approaches infinity)
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  2. #2
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    x \to \frac{\pi}{2}^- means "make x approach \frac{\pi}{2} from the left".

    x \to \frac{\pi}{2}^+ means "make x approach \frac{\pi}{2} from the right".
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  3. #3
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    and "from the left" means that x<\frac \pi2.
    "from the right" is the other way round
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