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    Narain's Avatar
    Narain Posts: 2, Reputation: 1
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    #1

    Nov 3, 2008, 12:59 AM
    trigonometric function
    2cos2x=1-7sinx-2cos2x
    basilrazi's Avatar
    basilrazi Posts: 27, Reputation: 2
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    #2

    Nov 3, 2008, 01:12 AM

    I cannot get past this:

    2cos2x+2cos2x=1-7sinx
    4cos2x=
    basilrazi's Avatar
    basilrazi Posts: 27, Reputation: 2
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    #3

    Nov 3, 2008, 01:13 AM

    sorry pressed eneter

    4cos2x=1-7sinx
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Nov 3, 2008, 10:29 AM

    Recall that cos2x = 1 - 2 sin^2x. Now you have a quadratic and can solve for sinx.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Nov 4, 2008, 03:14 AM

    And lastly for 'x'.
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