②若cos(已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π-α)求①化简f(α)②若cos(α-3/2π)=1/5求f(α)的值③若α=-1860°求f(α)的值
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![②若cos(已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π-α)求①化简f(α)②若cos(α-3/2π)=1/5求f(α)的值③若α=-1860°求f(α)的值](/uploads/image/z/1729768-40-8.jpg?t=%E2%91%A1%E8%8B%A5cos%EF%BC%88%E5%B7%B2%E7%9F%A5%CE%B1%E6%98%AF%E7%AC%AC%E4%B8%89%E8%B1%A1%E9%99%90%E8%A7%92f%28%CE%B1%29%3Dsin%28%CF%80-%CE%B1%29cos%282%CF%80-%CE%B1%29tan%28-%CE%B1-%CF%80%29%2Ftan%EF%BC%88-%CE%B1%EF%BC%89sin%EF%BC%88-%CF%80-%CE%B1%EF%BC%89%E6%B1%82%E2%91%A0%E5%8C%96%E7%AE%80f%EF%BC%88%CE%B1%EF%BC%89%E2%91%A1%E8%8B%A5cos%EF%BC%88%CE%B1-3%2F2%CF%80%EF%BC%89%3D1%2F5%E6%B1%82f%EF%BC%88%CE%B1%EF%BC%89%E7%9A%84%E5%80%BC%E2%91%A2%E8%8B%A5%CE%B1%3D-1860%C2%B0%E6%B1%82f%EF%BC%88%CE%B1%EF%BC%89%E7%9A%84%E5%80%BC)
②若cos(已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π-α)求①化简f(α)②若cos(α-3/2π)=1/5求f(α)的值③若α=-1860°求f(α)的值
②若cos(已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π-α)求①化简f(α)②若cos(α-3/2π)=1/5求f(α)的值③若α=-1860°求f(α)的值
②若cos(已知α是第三象限角f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π-α)求①化简f(α)②若cos(α-3/2π)=1/5求f(α)的值③若α=-1860°求f(α)的值
f(α)=sin(π-α)cos(2π-α)tan(-α-π)/tan(-α)sin(-π-α)
=sinα * cosα * (-tanα) /[(-tanα)*sinα]
=cosα
cos(α-3/2 π)=-cosα=1/5
f(α)=cosα=-1/5
f(-1860°)=cos(-1860°)=cos(1860°)=cos(10*180°+60)=cos60°=1/2
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