How do you evaluate $sec 780$ $sec 780$ ?

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How do you evaluate $sec 780$ $sec 780$ ?

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Answer 1 · 2016-12-24T15:05:58

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Explanation:

$sec (780) = \frac{1}{cos 780} .$ $sec (780) = 1/(cos 780).$
Find cos (780).
$cos (780) = cos (60 + 2 (360)) = cos 60$ $cos (780) = cos (60 + 2(360)) = cos 60$
Trig table gives:
$cos 60 = \frac{1}{2}$ $cos 60 = 1/2$ .
There for:
$sec 780 = \frac{1}{cos 60} = 2$ $sec 780 = 1/(cos 60) = 2$

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How do you evaluate $sec 780$ $sec 780$ ?

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