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Question
The value of cos1(cos 5π3)+sin1(sin 5π3) is
Options:
A .  0
B .  π2
C .  2π3
D .  10π3
Answer: Option A
:
A
cos1(cos5π3)+sin1(sin5π3)=cos1[cos(2ππ3)]+sin1[sin(2ππ3)]=π3π3=0.

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