If cos 60° = 1/2, which of the following angle has cosine of -1/2?

a

30o

b

120o

c

150o

d

210o

e

300o

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Correct Option
b

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Discussions (9)

Nanai0
2 years ago

i dont understand, like isn't negative cos in 360, then why use 180 degrees, please explain

unclepees
1 year ago

pls explain because my answer is supposed to be 300

Gloria Jumai
11 years ago

pls explain

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