Find all values of ? in [-4?, 4?] satisfying each of the following equations. cos ? = 1
A. ? = 0, 2?, 4?
B. ? = -4?, -2?, 2?, 4?
C. ? = -4?, -2?, 0, 2?, 4?
D. ? = -3?, -?, ?, 3?
Answer: C
Mathematics
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