Attachment 25527 Check the image. I know how to get the answer, but when I use the pythagorean theorem for Cosine 22.5 Why is the answer 2+Sqrt2? Why is it a PLUS instead of a minus? Please show me the steps.

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- Nov 2nd 2012, 04:18 PMEraser147Tangent of...
Attachment 25527 Check the image. I know how to get the answer, but when I use the pythagorean theorem for Cosine 22.5 Why is the answer 2+Sqrt2? Why is it a PLUS instead of a minus? Please show me the steps.

- Nov 2nd 2012, 04:35 PMMarkFLRe: Tangent of...
What you have posted seems incomplete. You have given the value of sin(22.5°) and speak of the cosine of this angle, and your topic title is "Tangent of...". What is it you are trying to find or show?

- Nov 2nd 2012, 04:41 PMskeeterRe: Tangent of...

**POSITIVE**because is a quadrant I angle - Nov 2nd 2012, 05:11 PMEraser147Re: Tangent of...
So when I do Pythagorean: 1 - 2 over 2 equals 2- over , but you're saying its in quadrant one so its automatically 2+ over 4???

- Nov 2nd 2012, 06:54 PMskeeterRe: Tangent of...

- Nov 2nd 2012, 07:05 PMEraser147Re: Tangent of...
Yeah my hw says its + sqrt two NOT that answer.

- Nov 2nd 2012, 07:26 PMskeeterRe: Tangent of...
- Nov 2nd 2012, 07:28 PMMarkFLRe: Tangent of...
The image you posted gives the same value for sin(22.5°) that

**skeeter**has given. If you are trying to find then use: