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OpenStudy (anonymous):
Find cos2(theta) if cos(theta) =3/4. Do I need to create a triangle, solve for sin, then set it equal to 1-2sin^2(theta)?
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OpenStudy (anonymous):
sorry wrong topic
OpenStudy (anonymous):
Why don't you just rewrite your double angle identity in terms of cos? sin^2(theta) = 1-cos^2(theta).
OpenStudy (anonymous):
don't worry i got it. I just wrote this under the wrong subtopic.
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