Question

Calcule o valor de cos pi / 3 + cos 2pi + cos 2pi / 3 ?

Answer 1

cos pi/3 = cos 180/3 = cos 60 = 1/2
cos 2pi = cos 2 . 180 = cos 360 = 1
cos 2pi/3 = cos 2 . 180/3 = cos 2 . 60 = cos 120 = -1/2

1/2 + 1 - 1/2 = 1

Answer 2

cos(π/3) + cos(2π) + cos(2π/3) = 1/2 + 1 + (-1/2) = 1

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Obrigado pela oportunidade 
Boa sorte, bons estudos!
SSRC - 2015 
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