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5 March, 13:14

Which of the following is a solution to 2cos x + 1 = 0?

A.

60°

B.

120°

C.

210°

D.

300°

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Answers (1)
  1. 5 March, 15:12
    0
    The answer is b

    2cos x + 1 = 0

    2 cos x = - 1

    cos x = - 1/2

    x = cos^1 (-1/2)

    (cos inverse (-1/2))

    x = 120°
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