For 0 ≤ θ < 2π , what are the solutions to sin2(θ) = 2sin2 (startfraction theta over 2 endfraction)? left-brace 0, startfraction pi over 2 endfraction, startfraction 3 pi over 2 endfraction right-brace left-brace 0, startfraction pi over 2 endfraction, pi right-brace left-brace 0, pi, startfraction 3 pi over 2 endfraction right-brace left-brace startfraction pi over 2 endfraction, pi, startfraction 3 pi over 2 endfraction right-brace