Show that cos^2(θ)-sin^2(θ)=2 cos^2(θ)-1=1-2 sin^2(θ) for all θ.

Name: Problem 93, Chapter 10: Precalculus
Uploaded: 2021-08-12T19:14:35-08:00
Duration: 1 min 34 s
Channel: Sheryl Ezze
Description: Show that cos^2(θ)-sin^2(θ)=2 cos^2(θ)-1=1-2 sin^2(θ) for all θ.

Question

Sheryl Ezze · Accepted Answer

step 1 So basically this question is looking at, we know that the cosine of 2 to theta, which we can pr

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