Expression 9: "Y" equals "y" times cosine left parenthesis, "a" , right parenthesis plus sine left parenthesis, "a" , right parenthesis "S"Y=y·cosa+sinaS
9
Expression 10: "Z" equals negative "y" times sine left parenthesis, "a" , right parenthesis plus cosine left parenthesis, "a" , right parenthesis "S"Z=−y·sina+cosaS
10
Expression 11: "S" equals StartFraction, left bracket, negative "N" , ... , "N" , right bracket Over "N" , EndFraction times left parenthesis, "R" cos left parenthesis, "a" , right parenthesis plus "r" plus StartFraction, 1 Over "N" , EndFraction , right parenthesisS=−N,...,NN·Rcosa+r+1N