Question: How i use algebra on this case: F x = 7 5 cos ( 3 0 ) - ACsen ( 3 0 ) - BCsen

How i use algebra on this case:
Fx=75 cos(30)-ACsen(30)-BCsen(60)=0
Fy=75 sen(30)+ ACcos(30)-BCcos(60)-60=0
How i use algebra on this case: F x = 7 5 cos ( 3

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