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Verified answer
TriGonoMetRisin (x + 30) + sin (x - 120) = 0
2 sin (x + 30 + x - 120)/2 cos (x + 30 - x + 120)/2 = 0
2 sin (x - 45) cos (-45) = 0
sin (x - 45) = 0
x - 45 = 0° ---> x = 45°
x - 45 = 180° ---> x = 225°
HP = {45° , 225°}