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Question

cos1x{cos(13π6)} is equal to


A

π6

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B

5π6

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C

π6

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D

None

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Solution

The correct option is B

5π6


cos1x{cos(13π6)} Use the result cos1(x)=πcos1x=πcos1(cos(13π6))=πcos1(cos(2π+π6))=πcos1(cos(π6))=ππ6=5π6


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