化简cot(-α-π)·sin(-π-α)
1.化简f(a)={[sin(π-α)cos(2π-α)cot(3π+α)]/[cot(-π-α)sin(-π-α)]}
化简cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α)
化简 sinαcosα(tanα+cotα)
化简sinαcosα(tanα+cotα)
化简:sinα ×cosα(tanα+cotα)
化简sin^2(α+π)cos(π+α)cot(-α+2π)/tan(π-α)cos^3(-α-π)
化简 [Sin(π+α)\tan(π+α)] ×[ cot(2π-α)\cos(π+α)]×[sec(2π-α)\csc
化简[sin(π-α)tan(5π/2+α)]/[cos(2π-α)cot(π/2-α)]
化简sin^2α*tanα+cos^2α*cotα+2sinα*cosα-cotα
化简sin²(α+π)·cos(π+α)·cot(-α-2π)/tan(π+α)·cos²(-α-π
化简 f(α)=sin(π—α) cos(2π—α)tan(-α+3/2π)/cot(-α-π)sin(-π-α)
已知sin(α+π/4)=根号6/3 ,tanα+cotα?