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Cos三分之二派怎么算

cos(2π/3) =-1/2.分析过程如下:π-α与α的三角函数值之间的关系:(1)sin(π-α)=sinα (2)cos(π-α)=-cosα (3)tan(π-α)=-tanα (4)cot(π-α)=-cotα 根据公式(3)可得:cos(2π/3) =cos(π-π/3) =-cosπ/3,而cosπ/3=cos60°=sin30°=1/2.所以cos(2π/3)

cos三分之二派=cos(π/6+π/2)=-sinπ/6=-1/2

三分之二派等于120°,cos120等于负二分之一

解答:cos2π/3=-1/2

cos3分之2派=cos120°=-1/2 如果我的答案对您有帮助,请点击下面的“采纳答案”按钮,送咱一朵小红花鼓励下吧!祝您生活愉快!谢谢!

cos(六分之派-阿法)=二分之一, cos(π/6-α)=1/2, 根据诱导公式,所以sin[π/2-(π/6-α)] =1/2, 即sin(π/3+α) =1/2, cos(2π/3+2α)= cos[2(π/3+α)] =1-2 sin(π/3+α) =1/2.

cos(π/3)=1/2 sin(π/3)=√3/2 tan(π/3)=√3 cot(π/3)=√3/3

cos2/3派就等于cos120°,根据公式就可得cos2/3派=负二分之一,高一学的公式..

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答: cos(2π/3) =cos(π-π/3) =-cosπ/3 =-1/2

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