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    zaibjaffer's Avatar
    zaibjaffer Posts: 4, Reputation: 1
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    #1

    Dec 4, 2008, 09:33 AM
    Trig Equations
    HI
    I have another problem
    Its from trig equations
    2cost - sint = -2 for 0<x<2pie



    can you show me a solution cause mine doesn't work.
    can we factor anything or use a trig identity for this... help me please.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 4, 2008, 10:58 AM

    One obvious solutoin is t = pi. To find the other solution, try moving the sin term to the right side of the equation, then square both sides. Then replace the cos^2(t) term with the equivalent 1-sin^2(t). You should be able to go from there.
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