anonymous
  • anonymous
Verify the identity. sin 4x = 2 sin 2x cos 2x
Precalculus
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
sin(4x) = sin( 2x + 2x) Recall that sin( A +B) = sin(A)cos(B) + cos(A)sin(B) so it is = sin2xcos2x + sin2xcos2x
anonymous
  • anonymous
can you figure out the rest?
anonymous
  • anonymous
What else do i do?

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anonymous
  • anonymous
what else is there to do other than add it ?
anonymous
  • anonymous
I dont know!! haha
anonymous
  • anonymous
haha well did I verify it ..now your done!
anonymous
  • anonymous
thank you so extremely much. :)
anonymous
  • anonymous
yw =))
anonymous
  • anonymous
U can use the identity sin2y=2sinycosy!! and take sin4x=sin2(2x) where take 2x as y and prove it!!

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