Question

If 2Cos 3 theta =1, then theta =?
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Answer 1

Answer:

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Answer 2

Step-by-step explanation:

$2 \cos(theta) = 1 \\ \\ \cos \: 3 \: theta = \frac{1}{2 } \\ \\ in \: terms \: of \: cos \: \\ \\ \frac{1}{2} can \: write \: as \: cos \: 60 \: degrees \\ \\ \\ \\ \cos \:3 \: theta = cos \: 60 \: degres \\ 3 \: theta = 60 \\ theta = \frac{60}{3} = 20degrees$

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