计算cos5分之派+cos5分之2派+cos5分之3派+cos5分之4派
(2),tan10度+tan170度+sin1866度-sin(-606度)
人气:320 ℃ 时间:2020-06-23 16:31:57
解答
(1)cos(π/5)+cos(2π/5)+cos(3π/5)+cos(4π/5) =cos(π/5)+cos(2π/5)-cos(2π/5)-cos(π/5) =0(2)tan10°+tan170°+sin1866°-sin(-606°) =tan10°+tan(180°-10°)+sin(5*360°+66°)-sin(-3...
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