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sin(-5π/3)= 求值 用三角函数的诱导公式
人气:372 ℃ 时间:2020-06-09 13:21:58
解答
sin(-5π/3)
=-sin(5π/3)
=-sin(π+2π/3)
=-(sinπcos2π/3+cosπsin2π/3)
=-(-sin2π/3)
=sin2π/3
=√3/2
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