Expression 4: "r" left parenthesis, left parenthesis, "t" , "f" left parenthesis, "t" , right parenthesis left bracket, "i" , right bracket , right parenthesis , pi "a" , right parenthesis for negative infinity less than "t" less than infinity , "i" equals left bracket, 1... "n" , right bracketrt,fti,πafor−∞<t<∞,i=1...n
4
Expression 5: "r" left parenthesis, "p" , "a" , right parenthesis equals left parenthesis, "p" . "x" cos left parenthesis, "a" , right parenthesis plus "p" . "y" sin left parenthesis, "a" , right parenthesis , negative "p" . "x" sin left parenthesis, "a" , right parenthesis plus "p" . "y" cos left parenthesis, "a" , right parenthesis , right parenthesisrp,a=p.xcosa+p.ysina,−p.xsina+p.ycosa