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Half-Angle Identities

Please show the steps in completing this problem. Please see attached file for full problem description.

10). Use the half-angle identities to evaluate tan(67.5) exactly.

A). 1 +
B). 1 -
C). -1 +
D). -1 -

[show the steps in completing this problem]

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Solution Summary

Half angle identities are investigated.

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