How do you find the value of #cos 300#?

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Answer 1 · 2016-08-04T14:41:14

#=0.5#

#cos300#
#=0.5#

Answer 2 · 2016-08-04T15:31:54

#cos(300^@)=1/2#

Imagine the unit circle:

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We know that #300^@# is in the fourth quadrant, where cosine is positive.

#300^@# has a reference angle of #60^@#, since it is #60^@# away from the #x#-axis.

Since #cos(60^@)=1/2#, we know that #cos(300^@)=1/2# as well since #cos(theta)>0# in the fourth quadrant.