Solve, finding all solutions.cos x = -  (Express your answer in radians.)

A.  + 2k? and -  + 2k?, where k is any integer
B.  + 2k? and   + 2k?, where k is any integer
C.  + 2k? and   + 2k?, where k is any integer
D.  + 2k? and   + 2k?, where k is any integer


Answer: C

Mathematics

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