Q. 9 A55.0( 4 Votes )

# If 2 cos 3 θ = 1, then the value of θ isA. 10oB. 15oC. 20oD. 30o

Given,

we know

θ = 20

cos3(20) = cos60

Option A is incorrect as it does not satisfy the value

Option B is incorrect as it does not satisfy the value

Option D is incorrect as it does not satisfy the value

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