Solve, finding all solutions.cos x = -1 (Express your answer in degrees.)
A. k ? 360°, where k is any integer
B. k ? 360° and 180° + k ? 360°, where k is any integer
C. 180° + k ? 360°, where k is any integer
D. 90° + k ? 360° and 270° + k ? 360°, where k is any integer
Answer: C
Mathematics
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? 
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