Come si trova il valore esatto di cos 5pi / 3?
Risposta:
#1/2#
Spiegazione:
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#