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Q)
If
I
n
=
π
/
4
∫
0
tan
n
θ
d
θ
for
n
=
1
,
2
,
3........
then
I
n
−
1
+
I
n
+
1
=
.
.
.
.
.
.
.
.
.
.
.
.
.
(
a
)
0
(
b
)
1
(
c
)
1
n
(
d
)
1
n
+
1
Share
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