Question

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If 2 cos 3 theta = 1 , then the value of theta is ?
*60°
*15°
*30°
*20°​

Answer 1

Answer:

Theta = 20 degree

Step-by-step explanation:

cos3theta = 1/2

3 x 20 = 60

cos 60 = 1/2

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Answer 2

Answer:

2 cos 3 theta = 1

cos 3 theta = 1/2

Since cos 60° =1/2

Therefore cos 3 theta = cos 60°

Theta = 20°

Step-by-step explanation:

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