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Math Help - sin ratio

  1. #1
    Senior Member furor celtica's Avatar
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    sin ratio

    is sin alpha = sin (2pi + alpha) a tried-and-proven sine relation?
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  2. #2
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    Quote Originally Posted by furor celtica View Post
    is sin alpha = sin (2pi + alpha) a tried-and-proven sine relation?
    Yes it is.

    Look at the unit circle. If you add 2\pi radians to an angle (measured in radians), then the angle is exactly the same.

    Thus the vertical distance, the sine of the angles, is exactly the same.
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  3. #3
    Senior Member furor celtica's Avatar
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    oh, true, thats obvious. thanks
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