3 years ago

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

Mathematics

1 answer:

nlexa [21]3 years ago

3 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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