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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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?
POSITIVE because is a quadrant I angle
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???
Yeah my hw says its + sqrt two NOT that answer.
Originally Posted by Eraser147 Yeah my hw says its + sqrt two NOT that answer. so check it with a calculator ...
The image you posted gives the same value for sin(22.5°) that skeeter has given. If you are trying to find then use:
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