Tan (x-Π\4) = cotΠ\3 , 0

cotbl π/3= cot (⅓×180)= cot 60°
π/4=¼×180=45°
cot 60°= tan 30°
maka:
tan(x-45°)=cot60°
tan(x-45°)= tan 30°
x-45°=30°
x=30°+45°
x=75°

semoga membantu!