Wie finden Sie den genauen Wert von cos 5pi / 3?

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#