Given that k is any integer, list all of the possible values for x that are in
the specified interval.
(a) π/2+ k· π, −3π ≤x≤ 3π
(b) π/6 + k· 2π, -2π≤x≤2π
(c) 7π/12 + k· π, 0 ≤ x< 2π
(d) 4/π+k• π/4 0 ≤ x< 4π