Given $sectheta=5$ and $tantheta=2sqrt6$ , how do you find $costheta$ ?

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Answer 1 · 2017-01-03T01:43:01

$1/5$

Use trig identity:
1/(cos^2 a) = sec^2 a
$cos^2 t = 1/(sec^2 t) = 1/ 25$
$cos t = 1/5$

Given sectheta=5sectheta=5 and tantheta=2sqrt6tantheta=2sqrt6, how do you find costhetacostheta?