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Question

If z is complex number then interpret the locus of following in complex plane Arg(z+i)Arg(zi)=π2.

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Solution

Arg(z+i)Arg(zi)=Π2
Let z=x+iy
Arg(x+iy+i)Arg(x+iyi)=Π/2
y+1xy1x=10
y+1y+1x=10
x=0

x=0 is the locus of z.

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