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L.S.=21+z=21+cosθ+isinθ=21+cosθ-isinθ1+cosθ2+sin2θ

=21+cosθ-isinθ1+2cosθ+cos2θ+sin2θ=21+cosθ-isinθ1+1+2cosθ

=21+cosθ-isinθ2+2cosθ=1+cosθ-isinθ1+cosθ

=1-isinθ1+cosθ=1-i2sinθ2cosθ22cos2θ2

=1-isinθ2cosθ2=1-i tanθ2=R.S showed

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