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Byju's Answer
Standard XII
Mathematics
Complex Numbers
If a= -1+i√...
Question
If
a
=
−
1
+
i
√
3
2
,
b
=
−
1
−
i
√
3
2
then show that
a
2
=
b
and
b
2
=
a
.
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Solution
a
=
−
1
+
i
√
3
2
⇒
a
2
=
(
−
1
+
i
√
3
2
)
2
=
1
+
3
i
2
−
2
√
3
i
4
=
1
−
3
−
2
i
√
3
4
=
−
2
−
2
i
√
3
4
=
−
1
−
i
√
3
2
=
b
b
=
−
1
−
i
√
3
2
⇒
b
2
=
(
−
1
−
i
√
3
2
)
2
=
1
+
3
i
2
+
2
√
3
i
4
=
1
−
3
+
2
i
√
3
4
=
−
2
+
2
i
√
3
4
=
−
1
+
i
√
3
2
=
a
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0
Similar questions
Q.
If
a
=
−
1
+
√
3
i
2
,
b
=
−
1
−
√
3
i
2
then show that
a
2
=
b
and
b
2
=
a
Q.
If
(
1
+
i
)
(
1
+
2
i
)
(
1
+
3
i
)
.
.
.
(
1
+
n
i
)
=
a
+
i
b
,
then
2
×
5
×
10
×
.
.
.
.
×
(
1
+
n
2
)
is equal to
(a)
a
2
+
b
2
(b)
a
2
-
b
2
(c)
a
2
+
b
2
(d)
a
2
-
b
2
(e)
a
+
b
Q.
Let
I
=
∫
(
n
+
1
n
)
3
π
3
n
π
4
x
d
x
[
(
a
2
+
b
2
)
+
(
a
2
−
b
2
)
cos
2
n
x
3
]
2
(where a,b>0)
prove that
I
=
9
(
2
n
2
+
1
)
π
n
2
a
2
−
b
2
a
3
b
3
Q.
If
a
=
−
1
+
√
3
i
2
,
b
=
−
1
−
√
3
i
2
then show that
a
2
=
b
and
b
2
=
a
.
Q.
If
a
=
2
+
√
3
and
b
=
2
−
√
3
then
1
a
2
−
1
b
2
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