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Math Help - Sine

  1. #16
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    Quote Originally Posted by ADY View Post
    How can there be two answers then? because of where the curve crosses the x axis?
    Sine is positive in the first and second quadrants.

    The solution the calculator gives you for \sin^{-1}{0.6} is the angle in the first quadrant.

    To find the angle in the second quadrant, subtract what you have found from 180^{\circ}.
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  2. #17
    Senior Member mollymcf2009's Avatar
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    For the function: y = sin (x) the graph crosses the x axis 3 times from 0 to 2\pi
      2\pi = 360 degrees

    For y = sin (x) - .6 the graphs shifts down .6 which makes decreases the area above the x axis and increases the area below the x axis and in turn changes where it intersects the x axis. Look at the attached graph and see if it helps.
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  3. #18
    ADY
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    Molly:

    What an excellent reply, that has really helped a lot!

    Thank you so much!



    Ady
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