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    salazar011's Avatar
    salazar011 Posts: 1, Reputation: 1
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    #1

    Mar 8, 2010, 08:33 PM
    4cos (square)x - 4cosx+1
    I'm trying to find the solution of the equation
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 9, 2010, 07:16 AM

    If you want to factorise this expression, use a substitution.

    For example, let y = cos x.

    Then, replace cos x by y in your expression and factorise the quadratic like any other quadratic:

    4y^2 - 4y + 1.

    When you are done, replace back y by cos x.
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