SOLUTION: Use the half-angle identities to find the exact value of the trigonometric expression. tan 22.5°

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Question 930585: Use the half-angle identities to find the exact value of the trigonometric expression.
tan 22.5°
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
tan%28x%2F2%29+=+tan%28x%29%2F%281+%2B+sqrt%281+%2B+tan%5E2%28x%29%29%29 for -pi/2 < x < pi/2
tan%2822.5%29+=+1%2F%281+%2B+sqrt%282%29%29+=+sqrt%282%29+-+1