How do you evaluate #sec 780#?

1 Answer

Dec 24, 2016

Explanation:

#sec (780) = 1/(cos 780).#
Find cos (780).
#cos (780) = cos (60 + 2(360)) = cos 60 #
Trig table gives:
#cos 60 = 1/2#.
There for:
#sec 780 = 1/(cos 60) = 2#

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How do you evaluate #sec 780#?

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