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(1-tan5π/12tanπ/4)/(tan5π/12+tanπ/4)的值
人气:242 ℃ 时间:2020-09-23 19:30:19
解答
原式=1/[(tan5π/12+tanπ/4)/(1-tan5π/12tanπ/4)]
=1/tan(5π/12+π/4)
=1/tan(2π/3)
=1/(-√3)
=-√3/3
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