A functionF(x) is defined to be even if f(-x) = f(x) for all x in the domain of f. The graph of an even function is symmetric with respect to the y-axis. Using the graph of y = cos x, we can verify that the cosine function is an even function by checking the symmetry. Which identity from Chapter 1 can be used to show the cosine is an even function if we want to use the definition ƒ (-x) = ƒ (x)?
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