How do I find the value of sec-240?

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Nghi N Share
Mar 3, 2018

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  • 2

Explanation:

#sec (-240) = 1/(cos (-240))#. Find cos (-240)
cos (-240) = cos (120 - 360) = cos 120.
Unit circle gives --> cos 120 = - 1/2
Finally,
sec (-240) = - 2

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