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How do I complete this identity? sin(2θ) sin(4θ) cos(2θ) cos(4θ) = ?
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Dec 28, 2021
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How do I complete this identity? sin(2θ) sin(4θ) cos(2θ) cos(4θ) = ?
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Greg Bestland
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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
Tautvydas
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Jan 1, 2022
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