What is the value of cos sign if the reference angle is 13 pi/3?

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What is the value of cos sign if the reference angle is 13 pi/3?

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Answer 1 · 2018-05-23T00:50:29

$\frac{1}{2}$ $1/2$

Explanation:

$\frac{13 π}{3} = \frac{π}{3} + 4 π$ $(13pi)/3 = pi/3 + 4pi$
$cos (\frac{13 π}{3}) = cos (\frac{π}{3} + 4 π) = cos (\frac{π}{3})$ $cos ((13pi)/3) = cos (pi/3 + 4pi) = cos (pi/3)$
$cos (\frac{π}{3})$ $cos (pi/3)$ is positive and equals to --> $cos (\frac{π}{3}) = \frac{1}{2}$ $cos (pi/3) = 1/2$ .

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What is the value of cos sign if the reference angle is 13 pi/3?

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