a) 81°
b) 40°
c) 80°
d) 41°
tan(2x) = B/(A-C) = 3/(-3-5) = -3/8
2x = 180+tan^-1(-3/8)
x = 79.7 ~ 80°
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Verified answer
tan(2x) = B/(A-C) = 3/(-3-5) = -3/8
2x = 180+tan^-1(-3/8)
x = 79.7 ~ 80°