已知f(α)=[sin(π-α)cos(2π-α)tan(-α+3π/2)]/[cot(-π-α)sin(-π-α)]
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已知f(α)=[sin(π-α)cos(2π-α)tan(-α+3π/2)]/[cot(-π-α)sin(-π-α)]
1.化简f(α)
2.若α是第三象限角,且cos(α-3π/2)=1/5,求f(α)的值
3.若α=-1860°,求f(α)的值
1.化简f(α)
2.若α是第三象限角,且cos(α-3π/2)=1/5,求f(α)的值
3.若α=-1860°,求f(α)的值
![已知f(α)=[sin(π-α)cos(2π-α)tan(-α+3π/2)]/[cot(-π-α)sin(-π-α)]](/uploads/image/z/5110780-4-0.jpg?t=%E5%B7%B2%E7%9F%A5f%28%CE%B1%29%3D%5Bsin%28%CF%80-%CE%B1%29cos%282%CF%80-%CE%B1%29tan%28-%CE%B1%2B3%CF%80%2F2%29%5D%2F%5Bcot%28-%CF%80-%CE%B1%29sin%28-%CF%80-%CE%B1%29%5D)
f(a)=-cosa
sina=-1/5,cosa=-2根号6/5,f(a)=2根号6/5
直接代入 f(a)=f(-7派/6)=-根号3/2
sina=-1/5,cosa=-2根号6/5,f(a)=2根号6/5
直接代入 f(a)=f(-7派/6)=-根号3/2
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