How do you find the exact value of cos 5pi/3?
1 Answer
Apr 30, 2016
Explanation:
The angle
#(5pi)/3" is located in the 4th quadrant "# where the cos ratio has a positive value.
The 'related' acute angle is
#(2pi - (5pi)/3) = pi/3 # and so
# cos((5pi)/3) = cos(pi/3) # Using the
#color(blue)" Exact value triangle for this angle" #
#rArr cos((5pi)/3)=cos(pi/3)=1/2#
