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Question

The value(s) of θ for which cosθ=12 is/are 


Your Answer
A
π3
Correct Answer
B
2π3
Correct Answer
C
4π3
Your Answer
D
π3

Solution

The correct options are
B 2π3
C 4π3
cosθ=12
So, 
θ(π2,3π2)
Now, when
cosθ=12θ=π3
Then
cosθ=12θ=ππ3,π+π3θ=2π3,4π3

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