4(sin18°)平方+4(cos36°)平方4sin²18°+4cos²36°=4sin²18°+4(1-sin²36°)=4-4(sin²36°-sin²18°)=4-4(sin36°+sin18°)(sin36°-sin18°)=4-4*2sin27°cos9°*2cos27°sin9°=4-4*(2sin27°cos27°)*(2sin9°cos9°)=4-

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 03:48:29
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