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nikkinicholaou Group Title

Verify the identity. sin 4x = 2 sin 2x cos 2x

  • one year ago
  • one year ago

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  1. mebs Group Title
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    sin(4x) = sin( 2x + 2x) Recall that sin( A +B) = sin(A)cos(B) + cos(A)sin(B) so it is = sin2xcos2x + sin2xcos2x

    • one year ago
  2. mebs Group Title
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    can you figure out the rest?

    • one year ago
  3. nikkinicholaou Group Title
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    What else do i do?

    • one year ago
  4. mebs Group Title
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    what else is there to do other than add it ?

    • one year ago
  5. nikkinicholaou Group Title
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    I dont know!! haha

    • one year ago
  6. mebs Group Title
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    haha well did I verify it ..now your done!

    • one year ago
  7. nikkinicholaou Group Title
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    thank you so extremely much. :)

    • one year ago
  8. mebs Group Title
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    yw =))

    • one year ago
  9. cambrige Group Title
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    U can use the identity sin2y=2sinycosy!! and take sin4x=sin2(2x) where take 2x as y and prove it!!

    • 11 months ago
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