设α, β为锐角,则sin(α+ β) ,sin β+sinα比大小
人气：287 ℃ 时间：2020-09-05 04:18:25
解答
sin(a+b) = sinacosb + sinbcosa
a,b为锐角
cosa,cosb < 1
=> sina *cosb < sina
=> sinb*cosa < sinb
=> sin(a+b) < sinb + sina
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