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    Well basically i can't be asked to do think, if someone will be kind enough to help me with these solutions.

    Solve

    a) sin2θ=sinθ {0<θ<2pie}

    b) cos2θ=1-cosθ {-180*<θ<180*}

    c) 2tan2ytany=3 {<y<360*}


    Thanks
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    Think graphically or substitute using identities for something squared then solve the quadratic.
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    too tired to think
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    Too tired to help you?
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    We're not doing your homework for you. We'll help you, yes, but we're not just giving you answers.

    For a), use the double-angle formula on sin2θ and factorise.
    For b), use the double-angle formula on cos2θ and then make it into a quadratic in cosθ.
    For c), again, use the double angle formula for tan2y.
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    Think of your double angle formulae.
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    Learn the double angle formulas then have another go
 
 
 
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Updated: November 10, 2008

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