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数学
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化简cos(π/3-θ)cosθcos(π/3+θ)
人气:393 ℃ 时间:2020-05-26 12:40:03
解答
cos(π/3-θ)cosθcos(π/3+θ)=[cos(π/3-θ+π/3+θ)+cos(π/3-θ-π/3-θ]cosθ/2=(cosθ)^3-3cosθ/4
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