三角函数积化和差 和差化积的所有公式
一定要准确
人气:236 ℃ 时间:2020-01-28 22:48:49
解答
sinθ+sinφ=2sin(θ/2+θ/2)cos(θ/2-φ/2) sinθ-sinφ=2cos(θ/2+φ/2)sin(θ/2-φ/2) cosθ+cosφ=2cos(θ/2+φ/2)cos(θ/2-φ/2) cosθ-cosφ=-2sin(θ/2+φ/2)sin(θ/2-φ/2) sinαsinβ=-1/2[cos(α+β)-cos(...
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