O conjunto solução da equação 2cos²x + cosx - 1 = 0, universo U= [0,2pi), é:
a) {pi/3, pi, 5pi/3}
b) {pi/6, pi, 5pi/3}
c) {pi/3, pi/6, pi}
d) {pi/6, pi/3, pi,2pi/3, 5pi/3}
e) {pi/3,2pi/3,pi,4pi/3,5pi/3,2pi}
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