"\\vec r=\\vec r(t)=2t\\vec i+t^2 \\vec j=(2t,t^2)"
(a) "\\vec r(1)=(2,1),\\,\\, \\vec r(3)=(6,9)"
(b) "\\Delta \\vec r=\\vec r(3)-\\vec r(1)=(4,8)"
(c) "x=2t,\\, y=t^2 \\rightsquigarrow y=0.25x^2" is the path equation
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