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

1 Answer

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The trigonometric equation is image.

image

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

General solution image:

If image, then image, where image is an integer.

image

Solution for the interval of image.

The solution is image.

answered Jun 28, 2016 by Anney Mentor

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