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    Trig Identities =[

    Propal
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    Propal


    Posts : 5
    Join date : 2009-05-09
    • Post n°1

    Trig Identities =[ Empty Trig Identities =[

    Post  Propal Sun May 10, 2009 12:59 am

    Prove that

    cos^6x - sin^6x = cos 2x(1 - 1/4 sin^2 2x)

    Edit: got it o.o
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