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cos45°sin²30°+2分之根号2sin²60°..
人气:375 ℃ 时间:2020-05-20 04:58:44
解答
cos45°sin²30°+2分之根号2sin²60°
=√2/2×1/4+√2/2 ×3/4
=√2/2×(1/4+3/4)
=√2/2×1
=√2/2
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