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数学
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化简Sin A + Sin 2A / 1+cos A +
人气：126 ℃ 时间：2020-05-20 14:17:18
解答
分子=sinA+sin2A=sinA+2sinAcosA = sinA * (1+2cosA)
分母=1+cosA+cos2A=2cos²A+cosA = cosA * (1+2cosA)
分子/分母 = sinA / cosA = tanA
这里面用到了
sin2A = 2 sinA cosA
cos2A = 2 cos²A - 1
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