Math, asked by dragomegaman, 11 months ago

Find x if cos2x = -1/2.

give step by step answer

Answers

Answered by riteshkumar90359

3

Answer:

x=-30

Step-by-step explanation:

cos2x=-1/2

cos2x=-cos 60

2x=-60

x=-30

Answered by artistvikash1

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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