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OpenStudy (anonymous):
Verify: sin(2π−α)=−sinα
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OpenStudy (anonymous):
do you recall the difference formula for sine?
OpenStudy (anonymous):
sin(A-B) = sinAcosB - sinBcosA apply this to your problem with A=2pi, B=alpha
OpenStudy (anonymous):
sin(α+β)=sinαcosβ+cosα sinβ
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