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Thread: Solving for X

  1. #1
    Jun 2008

    Solving for X

    Problem: With your calculator, solve for x over 0 \le x \le 2\pi.

    x-cos x = 0

    Attempted Solution: My first guess was to factor out x, but that would leave me with no cos value. Would that be permissible? Is not cosine value equal to cos 0? That's my only guess and I doubt it.

    If anyone could help, I would greatly appreciate it.
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  2. #2
    Junior Member
    Oct 2008
    cos(x) is a function, so you can't factor x out of it. The problem clearly mention the use of calculator. Draw the graph of y=x and y=cos(x) and then find their intersection points in the indicated interval.
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