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Find all real numbers in interval [0,2pi) which satisfy equation 2cos2x+1=0 use special angles

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precalculus

asked Jun 28, 2016 in PRECALCULUS by anonymous
reshown Jun 28, 2016 by goushi

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1 Answer

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The trigonometric equation is .

The function has a period of , first find all solutions in the interval .

General solution :

If , then , where is an integer.

Solution for the interval of .

The solution is .

answered Jun 28, 2016 by Anney Mentor

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