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Question

Theprincipalvalueofcos1(sin7π6)is:

A
5π3
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B
7π6
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C
π3
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D
none of these
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Solution

The correct option is B 5π3
We have, cos1(sin(7π6))
cos1(cos(π2+7π6))
cos1(cos(10π6))
cos1(cos(5π3))
5π3

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