Expression 20: "f" left parenthesis, "t" , right parenthesis equals "A" times sine left parenthesis, 2 times pi times "f" Subscript, 1 , Baseline times "t" , right parenthesisft=A·sin2·π·f1·t
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Expression 22: "r" left parenthesis, "t" , right parenthesis equals "f" left parenthesis, "t" , right parenthesis plus "v" left parenthesis, "t" , right parenthesisrt=ft+vt