double angle formula

double angle formula

[¦dəb·əl ′aŋ·gəl ‚fȯr·myə·lə]
(mathematics)
An equation that expresses a trigonometric function of twice an angle in terms of trigonometric functions of the angle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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