三角函数 诱导公式
sin(A+B)=sinAcosB+sinBcosAcos(A+B)=cosAcosB-sinAsinBtan(a+B)=tanA+tanB/1-tanAtanBcot(A+B)=(cotAcotB-1)/(cotB+cotA)
sin(x+y)=sinxcosy+cosxsinycos(x+y)=cosxcosy-sinxsinytan(x+y)=(tanx+tany)/(1-tanxtany)cot(x+y)=(cotxcoty-1)/(cotx+coty)
高一数学所有三角函数诱导公式
1.sin(2kπ+α)=sinαk∈zcos(2kπ+α)=cosαk∈ztan(2kπ+α)=tanαk∈zcot(2kπ+α)=cotαk∈z2.sin(π+α)=-sinαcos(π+α)=-cosαtan(π+α)=tanαcot(π+α)=cotα3.sin(-α)=-sinαcos(-α)=cosαtan(-α)=-tanαcot(-α)=-cotα4.sin(π-α)=sinαcos(π-α)=-cosαtan(π-α)=-tanαcot(π-α)=-cotα5.sin(2π-α)=-sinαcos(2π-α)=cosαtan(2π-α)=-tanαcot(2π-α)=-cotα6.sin(π/2+α)=cosαcos(π/2+α)=-sinαtan(π/2+α)=-cotαcot(π/2+α)=-tanαsin(π/2-α)=cosαcos(π/2-α)=sinαtan(π/2-α)=cotα7.sin(3π/2+α)=-cosαcos(3π/2+α)=sinαtan(3π/2+α)=-cotαcot(3π/2+α)=-tanαsin(3π/2-α)=-cosαcos(3π/2-α)=-sinαtan(3π/2-α)=cotαcot(3π/2-α)=tanα诱导公式记忆口诀:“奇变偶不变,符号看象限”。符号判断口诀:“一全正;二正弦;三两切;四余弦”。倒数关系:tanα・cotα=1sinα・cscα=1cosα・secα=1商的关系:sinα/cosα=tanα=secα/cscαcosα/sinα=cotα=cscα/secα平方关系sin^2(α)+cos^2(α)=11+tan^2(α)=sec^2(α)1+cot^2(α)=csc^2(α)两角和差公式sin(α+β)=sinαcosβ+cosαsinβsin(α-β)=sinαcosβ-cosαsinβcos(α+β)=cosαcosβ-sinαsinβcos(α-β)=cosαcosβ+sinαsinβtan(α+β)=(tanα+tanβ)/(1-tanα・tanβ)tan(α-β)=(tanα-tanβ)/(1+tanα・tanβ)二倍角的正弦、余弦和正切公式:sin2α=2sinαcosαcos2α=cos^2(α)-sin^2(α)=2cos^2(α)-1=1-2sin^2(α)tan2α=2tanα/(1-tan^2(α))tan(1/2*α)=(sinα)/(1+cosα)=(1-cosα)/sinα半角的正弦、余弦和正切公式sin^2(α/2)=(1-cosα)/2cos^2(α/2)=(1+cosα)/2tan^2(α/2)=(1-cosα)/(1+cosα)tan(α/2)=(1―cosα)/sinα=sinα/1+cosα万能公式sinα=2tan(α/2)/(1+tan^2(α/2))cosα=(1-tan^2(α/2))/(1+tan^2(α/2))tanα=(2tan(α/2))/(1-tan^2(α/2))三倍角的正弦、余弦和正切公式sin3α=3sinα-4sin^3(α)cos3α=4cos^3(α)-3cosαtan3α=(3tanα-tan^3(α))/(1-3tan^2(α))三角函数的和差化积公式sinα+sinβ=2sin((α+β)/2)・cos((α-β)/2)sinα-sinβ=2cos((α+β)/2)・sin((α-β)/2)cosα+cosβ=2cos((α+β)/2)・cos((α-β)/2)cosα-cosβ=-2sin((α+β)/2)・sin((α-β)/2)三角函数的积化和差公式sinα・cosβ=0.5[sin(α+β)+sin(α-β)]cosα・sinβ=0.5[sin(α+β)-sin(α-β)]cosα・cosβ=0.5[cos(α+β)+cos(α-β)]sinα・sinβ=-0.5[cos(α+β)-cos(α-β)]希望对你有帮助哈