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NDA Math Inverse Circular Functions
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© examsnet.com
Question : 13
Total: 25
What is the value of
cos
(
2
cos
−
1
0.8
)
?
[NDA II 2016]
0.81
0.56
0.48
0.2
Validate
Solution:
cos
(
2
cos
−
1
(
0.8
)
)
=
2
cos
2
(
cos
−
1
(
0.8
)
)
−
1
[
∵
cos
2
A
=
2
cos
2
A
−
1
]
=
2
[
cos
(
cos
−
1
(
0.8
)
)
]
2
−
1
=
2
(
0.8
)
2
−
1
=
0.28
© examsnet.com
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