Time remaining:
express the given product as a sum containing only sines/cosines

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Oct 18th, 2017

Sin(5θ) - Sin(3θ) = 2Cos[(5θ + 3θ)/2]Cos[(5θ - 3θ)/2]

                           = 2Cos[(8θ)/2]Cos[(2θ)/2]

                           = 2Cos(4θ)Cos(θ)

Mar 3rd, 2015

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