Yefim S. answered • 02/06/21
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cos7θ - cos9θ = 2sin[(7θ + 9θ)/2]sin[(9θ - 7θ)/2] = 2sin8θsinθ
Zoe S.
asked • 02/06/21Express as a product. (Use the Sum-to-Product formulas.)
Express as a product. (Use the Sum-to-Product formulas.)
cos 7𝜃 − cos 9𝜃
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