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Byju's Answer
Standard XII
Mathematics
Strictly Increasing Functions
Write the pri...
Question
Write the principal value of
cos
−
1
[
cos
680
o
]
.
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Solution
cos
−
1
[
cos
(
680
o
)
]
=
cos
−
1
[
cos
(
2
×
360
o
−
40
o
)
]
=
cos
−
1
[
cos
40
o
]
=
40
o
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Standard XII Mathematics
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