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3π/4 + 2π = 3π/4 + 8π/4 = 11π/4
ó
3π/4 - 2π = 3π/4 - 8π/4 = -5π/4
B) 135°:
135° + 360° = 495°
ó
135° - 360° = -225°
C) (4/7)π = 4π/7
4π/7 + 2π = 4π/7 + 14π/7 = 18π/7
ó
4π/7 - 2π = 4π/7 - 14π/7 = -13π/7
D) 80°
80° + 360° = 440°
ó
80° - 360° = -280°