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(sinπ/12+cosπ/12)(sinπ/12-cosπ/12)=
人气:349 ℃ 时间:2020-08-03 09:10:43
解答
原式=sin²(π/12)-cos²(π/12)
=-cos(2×π/12)
=-cos(π/6)
=-√3/2
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