Question

if 2cos^2(A/2)=1 find A


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Answer 1

Answer:

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Answer 2

Answer:

90°

Step-by-step explanation:

2 cos²(A/2) = 1

cos²(A/2) = 1/2

Square root on both sides

cos(A/2) = √(1/2)

cos(A/2) = 1/√2

cos(A/2) = cos 45°

A/2 = 45°

A = 45 × 2 = 90°

Hope it helps you:)