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WBJEE 2020 Math Solved Paper
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© examsnet.com
Question : 7
Total: 75
If
x
2
+
y
2
=
a
2
,
then
a
∫
0
√
1
+
(
d
y
d
x
)
2
d
x
=
2πa
πa
1
2
π
a
1
4
π
a
Validate
Solution:
y
1
=
−
x
y
a
∫
0
√
1
+
x
2
y
2
d
x
=
a
a
∫
0
1
y
.
d
x
=
a
a
∫
0
d
x
√
a
2
−
x
2
=
a
[
sin
−
1
(
x
a
)
]
0
a
=
a
π
2
© examsnet.com
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