KEAM 2013 Math Paper

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Question : 8 of 120
 
Marks: +1, -0
Let z1 and z2 be complex numbers such that z1+i(
−
z2
)
=0
and arg(
−
z1
z2
)
=
Ï€
3.
Then arg(
−
z
1
)
is
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