(sinθcosπ/3)-(cosθsinπ/3)怎么化简得sin(θ-π/3)

问题描述:

(sinθcosπ/3)-(cosθsinπ/3)怎么化简得sin(θ-π/3)

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)