Réponse :
Explications étape par étape :
■ 25π/6 = 24π/6 + π/6 = 4π + π/6 = π/6
■ 41π/3 = 36π/3 + 5π/3 = 12π + 5π/3 = 5π/3
■ 23π/5 = 20π/5 + 3π/5 = 4π + 3π/5 = 3π/5
■ 13π/4 = 16π/4 - 3π/4 = -3π/4
■ 16π/2 = 8π = 0
■ 12π/7 = 14π/7 - 2π/7 = 2π - 2π/7 = -2π/7 .
