已知f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-π-α)则f(-13π/3)的值是

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已知f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-π-α)则f(-13π/3)的值是
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已知f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-π-α)则f(-13π/3)的值是
已知f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-π-α)
则f(-13π/3)的值是

已知f(α)=sin(π-α)cos(2π-α)tan(-α+3π/2)/cos(-π-α)则f(-13π/3)的值是