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

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

User Greg Bestland
by
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1 Answer

6 votes

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

User Tautvydas
by
7.5k points
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