Question

find theta of 2cos4theta +1=2​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

2cos(4θ) + 1 = 2

2cos(4θ) = (2 - 1)

cos (4θ) = 1/2

(4θ) = cos-¹ (1/2).... equation (1)

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as we know that :-

cos60° = 1/2 Or

cos(π/3) = 1/2 Or

cos-¹ (1/2) = 60 or π/3

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now use this value in equation (1) . .

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(4θ) = cos-¹ (1/2)

(4θ) = π/3 θ= π/12 (ans)