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Mathematics, 27.01.2020 19:31 anime333

Which of the following best explains why cos 2pi/3 is not equal to cos 5pi/3
a. the angles do not have the same reference angle.
b. cosine is negative in the second quadrant and positive in the fourth quadrant.
c. cosine is positive in the second quadrant and negative in the fourth quadrant.
d. the angles do not have the same reference angle or the same sign.

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Which of the following best explains why cos 2pi/3 is not equal to cos 5pi/3
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