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KEAM 2021 Math Solved Paper
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© examsnet.com
Question : 9
Total: 120
tan
(
2
tan
−
1
(
2
5
)
)
is equal to
8
5
10
21
20
21
21
25
4
25
Validate
Solution:
tan
(
2
tan
−
1
(
2
5
)
)
Using the formula,
2
tan
−
1
x
=
tan
−
1
(
2
x
1
−
x
2
)
tan
(
2
tan
−
1
(
2
5
)
)
=
tan
[
tan
−
1
[
2
×
2
5
1
−
(
2
5
)
2
]
=
4
5
21
25
=
20
21
© examsnet.com
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