Pre-calc

Use a graphing utility to graph y1 and y2 in the interval [βˆ’2πœ‹, 2πœ‹]. Use the graphs to find real numbers x such that
y1 = y2.
(Enter your answers as a comma-separated list.)
y1 = cos x
y2 = 1

Is the answer πœ‹ ,-πœ‹ ? or is it zero? Because I don't see the lines intersecting within the interval [βˆ’2πœ‹, 2πœ‹]. Or am I just looking at the question incorrectly?

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  1. Wait can some one confirm if its -2Ο€, 0, 2Ο€?

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  2. Never mind I figured it out :)

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  3. the cosine of 0ΒΊ (0 rad) is 1 ... that should be in the middle of the interval

    -2Ο€ and 2Ο€ are the same location on the unit circle as zero
    ... are the ends of the interval included?

    look at the cosine curve

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