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数学
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sinA/2 + cosA/2=2分之根号6
A为锐角,求A的大小.
人气:249 ℃ 时间:2020-03-28 13:57:10
解答
sinA/2+cosA/2=√6/2
√2(√2/2sinA/2+√2/2cosA/2)=√6/2
√2sin(A/2+π/4)=√6/2
sin(A/2+π/4)=√3/2
∵A是锐角
∴0
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