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    nata1618's Avatar
    nata1618 Posts: 5, Reputation: 1
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    #1

    Apr 20, 2010, 04:16 PM
    trigonometry PROVING problems
    hi, I need help with this problem

    (2sin^2x-1)^2 / sin^4x-cos^4x = 1-2cos^2x
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #2

    Apr 20, 2010, 04:53 PM

    Correct me if I am wrong, your equation is:

    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Apr 21, 2010, 02:29 AM

    There are several identities to keep in mind and it falls into place.

    Note that



    and



    That last one is the same as on the right side of the equation, huh? :)
    nata1618's Avatar
    nata1618 Posts: 5, Reputation: 1
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    #4

    Apr 21, 2010, 04:04 PM

    Thanks...
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Apr 22, 2010, 10:25 AM

    Um... did you really understood the last two posts! :confused:
    nata1618's Avatar
    nata1618 Posts: 5, Reputation: 1
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    #6

    Apr 22, 2010, 04:14 PM

    not really? =/
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #7

    Apr 23, 2010, 10:52 PM

    If what you asked is really what we understood, then the question you asked is not a good proof.
    maburichoii04's Avatar
    maburichoii04 Posts: 1, Reputation: 1
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    #8

    Aug 9, 2010, 12:06 PM
    .. may I ask?. ahm, can u solve, x cube plus x squared minus 7x+5 divided by x+3?. can u get it?.

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