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Q.

Let S=zC:z¯=iz2+Re(z¯). Then zS|z|2 is equal to

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a

5/2

b

7/2

c

3

d

4

answer is B.

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Detailed Solution

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Let z = x + iy
z¯=iz2+Re(z¯) xiy=ix2y2+2ixy+x x=2xy and x2y2+x+y=0x=0 or y=1/2 If x=0;y2y=0y(y1)=0y=0,1 If y=1/2;x2+x3/4=04x2+4x3=0(2x1)(2x+3)=0x=3/2,1/2z=0;i,12i2,32i2
sum of |z|2=0+1+12+104=164=4

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