Answer:
Step-by-step explanation:
Equivalent polar coordinates will have the same modulus and some multiple of 360° added to the argument, or the opposite modulus and some odd multiple of 180° added to the argument.
a∠b° = a∠(b+360n)° = -a∠(b +180 +360n)°
Equivalents will be ...
(2, (-60 +360n)°) = (2, 300°)
(-2, (-60 +180 +360n)°) = (-2, -240°) = (-2, 120°)
Equivalents will be ...
(-2, (240 +360n)°) = (-2, -120°)
(2, (240 +180 +360n)°) = (2, -300°) = (2, 60°)