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
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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
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
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
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
1)cosα
2)2√6/5
3)-1/2
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