若sin(3π-α)=根号2sin(2π+β)
若sin(3π-2)=根号2sin(2π+β),根号3cos(-α)=-根号2cos(π+β)
已知sin(π+α)=根号3/2,求sin(3/4π-α)
已知sin(3π-α)=根号2*sin(π-β),根号3*cos(-α)=-根号2*cos(π+β),且α、β∈(0,π
cos(π/2-α)=根号2cos(3/2π+β),根号3sin(3π/2-α)=-根号2sin(π/2+β)且0
已知sin(3π-a)= 根号2sin(π-β),根号3cos(-a)= -根号2cos(π+β),且α β属于(0,π
已知β∈(3π/2,2π),化简根号(1=sinβ)-根号(1-sinβ)
sin(3π-α)=根号
cos2α/[sin(α-π/4)]=-根号2 /2,cosα+sinα=?
已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?
若α β是锐角tanβ=sinα -cosα / sinα + cosα 求证sinα -cosα=根号2sinβ
已知函数f(x)=2根号3sin平方x-sin(2x-π/3)
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)