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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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