Economics homework help. r=left parenthesis 6 Bold cos t right parenthesis Bold i plus left parenthesis 6 Bold sin t right parenthesis Bold j(6 cosisinjx2+y2=36. Find the? particle’s velocity and acceleration vectors at t equals StartFraction pi Over 6 EndFraction and StartFraction pi Over 3 EndFractiont=?6 and ?3?, and sketch them as vectors on the curve.v=left parenthesis nothing right parenthesisi+left parenthesis nothing right parenthesisj