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



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mebs
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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

mebs
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can you figure out the rest?

nikkinicholaou
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What else do i do?

mebs
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what else is there to do other than add it ?

nikkinicholaou
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I dont know!! haha

mebs
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haha well did I verify it ..now your done!

nikkinicholaou
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thank you so extremely much. :)

mebs
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yw =))

cambrige
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U can use the identity sin2y=2sinycosy!!
and take sin4x=sin2(2x) where take 2x as y and prove it!!