Use words to describe the formula for:the cosine of double an angle. Describe one of the three formulas.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter10: Measurement, Area, And Volume
Section10.1: Triangles
Problem 30E
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Use words to describe the formula for:the cosine of double an angle. Describe one of the three formulas.

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