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do know how to work this hard one

0 votes

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.)

2 cos2 θ 5 cos θ + 2 = 0

θ =

 

asked Apr 8, 2016 in PRECALCULUS by anonymous

1 Answer

0 votes

The trigonometric equation is image.

Let .

image

Substitute in the factors.

image

General solution image:

Since image, it has no real solutions.

General solution :

If , then image, where is an integer.

image.

The general solution is image.

answered Apr 11, 2016 by Anney Mentor

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