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Trigonometry
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OpenStudy (anonymous):
Derive the identity cos^2(θ/2)=(1+cosθ)/2? I think I'm supposed to use the doble-angle identity cos2θ=2cos^2θ-1 but I don't know the rest. Help is appreciated!
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OpenStudy (loser66):
hey!! still need help?
OpenStudy (anonymous):
yes please :)
OpenStudy (loser66):
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