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Q.

The complex equation z+1-i=z+i-1 represents a

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a

circle

b

parabola

c

straight line

d

hyperbola

answer is A.

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Detailed Solution

z+1-i=z+i-1 substitute z=x+iy x+iy+1-i=x+iy+i-1 (x+1)+i(y-1)=(x-1)+i(y+1) (x+1)2+(y-1)2=(x-1)2+(y+1)2 x2+1+2x+y2+1-2y=x2+1-2x+y21+2y 4(x-y)=0  x-y=0  is a straight line

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