复数已知z=sinθ+(2-cos^2θ)i,0≤θ

问题描述:

复数已知z=sinθ+(2-cos^2θ)i,0≤θ
1.复数已知z=sinθ+(2-cos^2θ)i,0≤θ

∵0≦θ<2π, ∴0≦2<4π, ∴-1≦cos2θ≦1.而|z|=√{(sinθ)^2+[2-(cosθ)^2θ]^2}=√[1-(cosθ)^2+4-4(cosθ)^2+(cosθ)^4]=√[(cosθ)^4-5(cosθ)^2+5]=√{[(cosθ...