Step 1 Recall that cosine has period 2. We must first recognize that 8 is greater than 27. We also note that 8x is evenly divisible by 2x. Therefore, we can simplify by rewriting 8 as the sum of a multiple of 2 and 0. cos(8x) = cos(4✔ (2x) + 0) Step 2 By rewriting cos(8x) as cos(4(2x) + 0) we can conclude that cos(8x) is equivalent to which of the following? cos (1) O cos(x) O cos(4) s(²) O cos O cos(0) X Thus, we have the following result. cos(8x)=0 X

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