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Byju's Answer
Standard IX
Mathematics
Axioms
If z1 and z2 ...
Question
If z
1
and z
2
are two complex numbers such that
z
1
=
z
2
and arg(z
1
) + arg(z
2
) =
π
, then show that
z
1
=
-
z
2
¯
.
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Solution
Let θ
1
be the arg(z
1
) and θ
2
be the arg(z
2
).
It is given that
z
1
=
z
2
and arg(z
1
) + arg(z
2
) =
π
.
Since, z
1
is a complex number.
z
1
=
z
1
cos
θ
1
+
i
sin
θ
1
=
z
2
cos
π
-
θ
2
+
i
sin
π
-
θ
2
=
z
2
-
cos
θ
2
+
i
sin
θ
2
=
-
z
2
cos
θ
2
-
i
sin
θ
2
=
-
z
2
¯
Hence,
z
1
=
-
z
2
¯
.
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