90°±α,270°±α的三角函数值等于α的相应正余相反的函数值什么意思,跪求大神赐教
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解决时间 2021-12-03 07:24
- 提问者网友:嗝是迷路的屁
- 2021-12-02 14:17
90°±α,270°±α的三角函数值等于α的相应正余相反的函数值什么意思,跪求大神赐教
最佳答案
- 五星知识达人网友:玩世
- 2021-12-02 15:03
sin(π/2+α)= cosα
cos(π/2+α)= -sinα
tan(π/2+α)= -cotα
cot(π/2+α)= -tanα
sin(π/2-α)= cosα
cos(π/2-α)= sinα
tan(π/2-α)= cotα
cot(π/2-α)= tanα
sin(3π/2+α)= -cosα
cos(3π/2+α)= sinα
tan(3π/2+α)= -cotα
cot(3π/2+α)= -tanα
sin(3π/2-α)= -cosα
cos(3π/2-α)= -sinα
tan(3π/2-α)= cotα
cot(3π/2-α)= tanα
正弦对应余弦,正切对应余切
cos(π/2+α)= -sinα
tan(π/2+α)= -cotα
cot(π/2+α)= -tanα
sin(π/2-α)= cosα
cos(π/2-α)= sinα
tan(π/2-α)= cotα
cot(π/2-α)= tanα
sin(3π/2+α)= -cosα
cos(3π/2+α)= sinα
tan(3π/2+α)= -cotα
cot(3π/2+α)= -tanα
sin(3π/2-α)= -cosα
cos(3π/2-α)= -sinα
tan(3π/2-α)= cotα
cot(3π/2-α)= tanα
正弦对应余弦,正切对应余切
全部回答
- 1楼网友:酒安江南
- 2021-12-02 16:20
sin(90°±α)=cosα.
cos(90°-α)=sinα.
cos(90°+α)=-sinα.
sin(270°±α)=-cosα,
cos(270°-α)=-sinα,
cos(270°+α)=sinα,
cos(90°-α)=sinα.
cos(90°+α)=-sinα.
sin(270°±α)=-cosα,
cos(270°-α)=-sinα,
cos(270°+α)=sinα,
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