In Exercises 53 56, graph each side of the equation in the
Chapter 5, Problem 5.6.173(choose chapter or problem)
In Exercises 53 56, graph each side of the equation in the same viewing rectangle. If the graphs appear to coincide, verify that the equation is an identity. If the graphs do not appear to coincide, find a value of for which both sides are defined but not equal.cos x + cos 3x = 2 cos 2x cos x
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