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What is the value of cos sign if the reference angle is 13 pi/3?

1 Answer

May 23, 2018

#1/2#

Explanation:

#(13pi)/3 = pi/3 + 4pi#
#cos ((13pi)/3) = cos (pi/3 + 4pi) = cos (pi/3)#
#cos (pi/3)# is positive and equals to --> #cos (pi/3) = 1/2#.

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