cos pi/3

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Explicación corta, 'π' vale 180°, entonces 180°/3 = 60° y el coseno de 60 es 1.5 (o lo que es lo mismo, un medio, 1/2).

Explicación larga: "π" se relaciona con una circunferencia como "π radianes", entonces un circulo siempre es de 360 grados, o lo que es lo mismo, 2π radianes (2*π = 360°). Por lo tanto, si 2π es 360°, un solo "π" equivale a 180°; 180/3 = 60 y coseno de 60 = 1/2.

davidll