# Pre-calc

Use a graphing utility to graph y1 and y2 in the interval [β2π, 2π]. Use the graphs to find real numbers x such that
y1 = y2.
y1 = cos x
y2 = 1

Is the answer π ,-π ? or is it zero? Because I don't see the lines intersecting within the interval [β2π, 2π]. 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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