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- A beam is supported by a roller at A and a pin at B. Determine the reactions at A and B when P = 15 kips. Neglect the weight of the beam.Consider the vectors A=<1,2,3>, B=<-2,1,0>, and C=<0,3,1>. (a)Find the angle between A and B. (b)Find the component of A in the direction of C.B) Which property of the vectors is inaccurate?