Since 12π/5 =2π +2π/5 and 2π is one complete rotation, therefore the coterminal angle between 0 and 2π is 2π/5
To prove this
2π≈ 6.2831853071795865 and
2π/5≈ 1.2566370614359173
0<1.2566370614359173<6.2831853071795865
