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Math Help - Trigonometric equations....

  1. #1
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    Trigonometric equations....

    For lack of a better name...

    Anyway, here's my problem. In the answers (second image uploaded), they've stated that it's okay to use values outside the domain, as long as they'll eventually fit in the domain as values of x. Is this okay?
    This would be meaningless without the images...so take a look at them
    Attached Thumbnails Attached Thumbnails Trigonometric equations....-mathhelptrig.jpg   Trigonometric equations....-mathhelptrig2.jpg  
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  2. #2
    MHF Contributor
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    The given domain is [0, 2\pi]. This specifies what values of x are legal, not what values of 2x are legal. So if x can be any value in the interval [0, 2\pi], then 2x can be anywhere in the interval [0, 4\pi].
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  3. #3
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    Ah, that makes sense. Thank you. =]
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