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2 f^2 - 7f + 3 = 0
(2f - 1)(f - 3)
f = 1/2 v 3 (TM)
cos x = 1/2
cos x = 60°
x1 = 60° + k.360°
x1 = 60° (k = 0)
x2 = -60° + k.360°
x2 = 300° (k = 1)
bila 0° <_ x <_ 360°
HP: {x | 60° , 300°}
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