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Question

The value of sin1{cos(33π5)} is

A
3π5
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B
7π5
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C
π10
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D
π10
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Solution

The correct option is C π10
Given, sin1{cos(33π5)}

The above expression can be written as

π2cos1(cos(6π+3π5))

=π23π5

=π10

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