Expression 4: "r" equals "b" plus left parenthesis, StartFraction, "a" Over "b" , EndFraction , right parenthesis cosine left parenthesis, "a" theta , right parenthesisr=b+abcosaθ
4
Expression 5: "r" equals "b" plus left parenthesis, StartFraction, "a" squared Over "b" , EndFraction , right parenthesis cosine left parenthesis, "a" theta , right parenthesisr=b+a2bcosaθ
5
Expression 6: "r" equals "b" plus left parenthesis, StartFraction, "a" Over "b" squared , EndFraction , right parenthesis cosine left parenthesis, "a" theta , right parenthesisr=b+ab2cosaθ
6
Expression 7: "r" equals "b" plus left parenthesis, StartFraction, "a" Over "b" squared , EndFraction , right parenthesis cosine left parenthesis, "b" theta Superscript, "b" , Baseline , right parenthesisr=b+ab2cosbθb