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posted by stacey graham on Thursday, March 25, 2010 at 2:26pm.

verify the identity sin(4u)=2sin(2u)cos(2u)

LS =sin(4u) = sin(2u + 2u) = sin(2u)cos(2u) + cos(2u)sin(2u) = 2sin(2u)cos(2u) = RS

Good

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