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tan的平方30°+2sin60°.cos45°+tan45°-cos的平方30°-1/tan60°
人气:408 ℃ 时间:2020-02-03 07:25:09
解答
原式=(√3/3)²+2×√3/2×√2/2+1-(√3/2)²-1/√3
=1/3+√6/2+1-3/4-√3/3
=7/12-√6/2-√3/3
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