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Math Help - 2 quick sin/cos problems, solving for an angle

  1. #1
    Junior Member
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    2 quick sin/cos problems, solving for an angle



    Thanks!
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  2. #2
    MHF Contributor
    Joined
    Sep 2008
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    West Malaysia
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    Re :

    (1) sinx=cos2x-1
    sinx=1-2sin^2x-1
    sinx=-2sin^2x
    sinx(2sinx+1)=0
    solve for sinx=0 and 2sinx+1=0

    (2) sinx+cosx=0]
    sinx=-cosx
    tanx=-1
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