Given $theta = (19pi) / 6$ how do you find $costheta$ ?

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Answer 1 · 2015-06-23T04:32:50

Find $cos ((19pi)/6)$

$cos ((19pi)/6) = cos ((7pi)/6 + 2pi)$ = $cos (pi/6 + pi)$ =

$= -cos (pi/6) = (-sqrt3)/2$

Given theta = (19pi) / 6theta = (19pi) / 6 how do you find costhetacostheta?