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

    Dec 15, 2010, 12:41 PM
    Trig identities
    2cosxsinx+sinx=0
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 15, 2010, 01:09 PM

    Just a little manipulation: 2cosxsinx+ sinx = 0 leads to:
    2sinx(cosx+1/2) = 0
    So either sinx=0 or cosx = -1/2. Can you take it from here and tell us what x may be?
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