Expression 18: "D" Subscript, 1 , Baseline equals "R" cosine left parenthesis, "L" left bracket, 4 , right bracket , right parenthesis equals negative 6D1=RcosL4
equals=
negative 6−6
18
Expression 19: "D" Subscript, 2 , Baseline equals "R" sine left parenthesis, "L" left bracket, 4 , right bracket , right parenthesis equals 0D2=RsinL4
equals=
00
19
Expression 20: "E" Subscript, 1 , Baseline equals "R" cosine left parenthesis, "L" left bracket, 5 , right bracket , right parenthesis equals negative 3E1=RcosL5
equals=
negative 3−3
20
Expression 21: "E" Subscript, 2 , Baseline equals "R" sine left parenthesis, "L" left bracket, 5 , right bracket , right parenthesis equals negative 5.1 9 6 1 5 2 4 2 2 7 1E2=RsinL5