How do I find the exact value without any decimals?

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- December 9th 2012, 11:42 AMEraser147Find the exact value of Cos 11.25 degrees
How do I find the exact value without any decimals?

- December 9th 2012, 11:50 AMPlatoRe: Find the exact value of Cos 11.25 degrees
- December 9th 2012, 11:53 AMrichard1234Re: Find the exact value of Cos 11.25 degrees
11.25 degrees = pi/16

(in the domain that we're interested in)

Then just apply this half-angle formula a couple times to get your answer. - December 9th 2012, 12:18 PMEraser147Re: Find the exact value of Cos 11.25 degrees
So it would be Sqrt 1 + (2)11.25 divided by 2?

- December 9th 2012, 12:27 PMskeeterRe: Find the exact value of Cos 11.25 degrees
- December 9th 2012, 12:40 PMEraser147Re: Find the exact value of Cos 11.25 degrees
^ Makes a lot more sense. Thanks.