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Question #995f2

1 Answer

Feb 21, 2017

$-2.0$

Explanation:

$sec(-120°)$

on the calculator:
$cos-120$ then press $1/x=-2.0$

or:

$:.=1/(Cos(-120))$

$:.=1/-0.5$

$:.=1/(-5/10$

$:.=1/(-1/2)$

$:.=1/1-:-1/2$

$:.=1/1 xx -2/1$

$:.=-2$

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