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Q.

If Ampz + 2z - 4i = π2 then the locus of z = x + iy is

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a

x2 + y2 + 3x - 2 = 0, y = 0

b

x = 0 such that y > 2/3

c

x2 + y2 + 2x - 4y = 0, such that y < 0, x2 + y2 >1

d

x2 + y2 + 2x - 4y = 0 such that  2x - y + 4 > 0

answer is D.

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Detailed Solution

Amp z+2z-4i=π2,  z=x+iy Amp (x+2)+iyx+i(y-4)=π2 Tan-1 yx+2-Tan-1 y-4x=π2 yx+2-y-4x1+yx+2.y-4x=xy-xy-xy+4x+8x(x+2)+y(y-4)= x(x+2)+y(y-4)=0 and -2y+4x+8>0       x2+y2+2x-4y=0    and          2x-y+4>0

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