根号sin的平方120度等于?我要具体步骤
根号sin的平方120度等于?我要具体步骤
数学人气：936 ℃时间：2020-05-19 02:15:52
优质解答
√﹙sin²120°﹚=√﹙sin²60°﹚=√3／2
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