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OpenStudy (anonymous):
Try this => Prove the identity cos 3θ ≡ 4 cos^3 θ − 3 cos θ.
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OpenStudy (anonymous):
expand this... cos(2@+@) then put cos 2@= 2cos^2 @ -1
OpenStudy (anonymous):
what?
OpenStudy (anonymous):
3@= 2@ + @ do you agree?
OpenStudy (anonymous):
yes
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