robertAP robertAP

19-07-2020
Mathematics

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How do I complete this identity? sin(2θ) sin(4θ) cos(2θ) cos(4θ) = ?

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bekkarmahdi702 bekkarmahdi702

19-07-2020

Answer:

sin(20) sin(40) cos(40) cos(20)
[sin(20)*cos(20)]*[sin(40)*cos(40)]
[sin(2*20)/2]*[sin(2*40)/2]
[sin(40)*sin(80)]/2

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