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Expand 2 cos (2 b) using a double angle identity in terms of sines

 May 16, 2015

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2cos(2B)=2(cos2Bsin2B)=2(1sin2Bsin2B)=2(12sin2B)

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 May 17, 2015
 #1
avatar+118696 
+10
Best Answer

2cos(2B)=2(cos2Bsin2B)=2(1sin2Bsin2B)=2(12sin2B)

Melody May 17, 2015

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