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sin7/6丌的值和cos5/6丌的值是多少
人气:258 ℃ 时间:2020-06-11 03:29:43
解答
sin (7/6)π
=sin (1/6)π + π
=-sin(1/6)π
=-1/2
cos (5/6)π
=cos π - (1/6)π
=-cos(1/6)π
=-√3/3
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