sin^3(Pi/2) = 1^3 = 1
sin(Pi^3/8) = sin((Pi/2)^3) = sin((Pi/2)(Pi/2)(Pi/2)) = sin(Pi^3/8) = sin(Pi^3/8) = sin(4.712) ≈ -0.999996.
sin^3(Pi/2) = 1^3 = 1
sin(Pi^3/8) = sin((Pi/2)^3) = sin((Pi/2)(Pi/2)(Pi/2)) = sin(Pi^3/8) = sin(Pi^3/8) = sin(4.712) ≈ -0.999996.