cos(π÷5)+cos(2π÷5)等于多少?不要用计算器!
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cos(π÷5)+cos(2π÷5)等于多少?不要用计算器!
计算:cos(π/5)+cos(2π/5)+cos(3π/5)+cos(4π/5)
求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
求值:cos(π/11)-cos(2π/11)+cos(3π/11)-cos(4π/11)+cos(5π/11)
cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
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