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Calculati : sin de pi/3
sin 2pi/3
cos pi/3
cos2pi/3


Răspuns :

sin pi/3=sin60 grade=radical din 3/2
sin 2pi/3=sin120 grade=radical din 3/2
cos pi/3=cos60 grade=1/2
cos 2pi/3=cos120 grade= - 1/2
sin π /3 = √3  /  2
sin 2π /3 = √3 / 2
cos π/3 = 1 /2 
cos2π /3 = - 1 /2