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tan30°sin60°+cos^30°-sin^45°tan45°
人气:440 ℃ 时间:2020-03-22 16:43:32
解答
tan30°sin60°+cos^30°-sin^45°tan45°
=根号3/3*根号3/2-(根号3/2)^2-(根号2/2)^2*1
=1/2-3/4-1/2
=-3/4
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