When #cosx=1#, what does #x# equal?

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Sep 30, 2016

Answer:

#x# can be any integer multiple of #2pi#, including #0#

Explanation:

The function #cos(x)# has period #2pi# and #cos(0) = 1#

Hence:

#cos(2npi) = 1" "# for any integer #n#

graph{cos(x) [-10, 10, -5, 5]}

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