A. (2n+1) π/4 : n ε Z or 2n π ± 2 π/3: n ε Z
B. nπ/4: n ε Z or nπ ± π/6: n ε Z
C. nπ: n ε Z or (2n+1) π/9: n ε Z
D. (2n+1) π / 10: n ε Z or 2nπ/3 ± π / 9: n ε Z
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