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Chapter 5: Q 8. (page 495)

Double-angle identities: Use double-angle identities to rewrite each of the following trigonometric expressions until no exponents are involved.

cos2x=____

Short Answer

Expert verified

cos2胃+12=cos2胃

Step by step solution

01

Step 1. Given information.

Consider the given information.

cos2x

02

Step 2. Explanation.

Write the given trigonometric expression in cosine form.

cos2胃=cos2胃-sin2胃=cos2胃-1-cos2胃=cos2胃-1+cos2胃=2cos2胃-1cos2胃+1=2cos2胃cos2胃+12=cos2胃

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