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Question

The value of cos1(cos680) is

A
2π9
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B
2π9
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C
34π9
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D
π9
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Solution

The correct option is A 2π9
cos1(cos(680))=cos1[cos(72040)]=cos1[cos(40)]=40 (cos1(cosx)=x, x[0,π])=2π9

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