f(x) = If[0 ≤ x ≤ (4 * pi), sin(x + pi / 2)]
A: (0, cos(0))
B: (pi / 4, cos(pi / 4))
C: (pi / 2, cos(pi / 2))
D: (pi, cos(pi))
E: ((3 * pi / 2), cos((3 * pi / 2)))
F = (6.283185307179586, 1)
g(x) = If[0 ≤ x ≤ (4 * pi), cos(x)]