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Math Help - sin of 2 theta

  1. #1
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    sin of 2 theta

    If theta equals .79, do we multiple .79 by 2 before finding the sine, or do we find the sine and then multiply by 2?
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  2. #2
    Super Member TheChaz's Avatar
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    Re: sin of 2 theta

    sine of 2 theta is denoted by

    \sin (2 \theta)

    And the multiplication happens before the sine is applied.

    There is an identity (which I'm guessing you haven't learned yet)

    \sin (2 \theta) = 2\sin(\theta) \cdot \cos(\theta)
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