I solve these two equations and I got x=51.65degree but in my book x=128.35
so Iam confused
the equations are:
54.684=F Cos x...........(1)
69.313=F Sin x.............(2)
So your equations are F cos(x)= -54.684 and F sin(x)= 69.313?
Then clearly 51.65 degrees cannot be correct. I presume neglecting the negative was your error in doing the calculation and you see now that
128.35 degrees is correct? (Actually, I get 128.27 degrees.)