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given cos26=k find cos13

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Answer to a math question given cos26=k find cos13

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Miles
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cos(2ΞΈ) = 2 \times cos^2(ΞΈ) - 1 cos^2(ΞΈ) = \frac{(cos(2ΞΈ) +1)}{2} cos^2(13) = \frac {cos(26) +1}{2} cos^2(13) = \frac{k +1}{2} \cos\:13\:=\pm\sqrt{\left(\frac{k+1}{2}\right)}}

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