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Question

The value of cos1(cos 5π3)+sin1(sin 5π3) is

A
0
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B
π2
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C
2π3
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D
10π3
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Solution

The correct option is A 0
cos1(cos 5π3)+sin1(sin 5π3)=cos1[cos (2ππ3)]+sin1[sin(2ππ3)]=π3π3=0.

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