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(sinθcosπ/3)-(cosθsinπ/3)怎么化简得sin(θ-π/3)
人气:341 ℃ 时间:2020-03-31 06:56:10
解答
因为sinαcosβ-cosαsinβ = sin(α-β)
对照上面公式用θ代换α,用π/3代换β,即可得
sinθcosπ/3 - cosθsinπ/3 = sin(θ - π/3)
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