Trigonometria 20 pontos! (UNIFENAS 2018) ) Dado que 0°< x < 180°, obtenha o conjunto solução de: (senx)2 - [(1/4) + (2/8)].senx - (1/2) = 0.

a) 30°. b) 45°. c) 60°. d) 90°. e) 120°
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