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

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

Guest May 16, 2015

Best Answer

+118696

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$\\2cos(2B)\\ =2(cos^2B-sin^2B)\\ =2(1-sin^2B-sin^2B)\\ =2(1-2sin^2B)\\$

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Melody May 17, 2015

1⁺⁰ Answers

+118696

+10

Best Answer

$\\2cos(2B)\\ =2(cos^2B-sin^2B)\\ =2(1-sin^2B-sin^2B)\\ =2(1-2sin^2B)\\$

Melody May 17, 2015

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