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WBJEE 2014 Maths Solved Paper
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© examsnet.com
Question : 51
Total: 80
If
s
i
n
−
1
(
x
13
)
+
c
o
s
e
c
−
1
(
13
12
)
=
π
2
, then the value of x is
5
4
12
11
Validate
Solution:
s
i
n
−
1
(
x
13
)
=
π
2
-
c
o
s
e
c
−
1
(
13
12
)
=
s
e
c
−
1
(
13
12
)
=
c
o
s
−
1
12
13
s
i
n
−
1
(
x
13
)
=
s
i
n
−
1
5
13
x = 5
© examsnet.com
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