Find x if cos2x = -1/2.
give step by step answer
Answers
Answered by
3
Answer:
x=-30
Step-by-step explanation:
cos2x=-1/2
cos2x=-cos 60
2x=-60
x=-30
Answered by
2
Answer:
cos is negative
it means
it is in 2nd and 3rd quadrant
then
2x=120
or
2x=240
x is 60 or 120
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