Expression 5: "a" equals StartFraction, StartRoot, 2 times left parenthesis, 1 minus cos left parenthesis, "b" , right parenthesis , right parenthesis , EndRoot Over "b" , EndFraction equals 0.8 8 3 8 5 9 3 0 0 1 6 5a=2·1−cosbb
Expression 7: left parenthesis, "y" minus StartFraction, "a" Over 2 , EndFraction , right parenthesis squared plus left parenthesis, "x" minus 1 minus "R" times cos left parenthesis, StartFraction, "b" Over 2 , EndFraction , right parenthesis , right parenthesis squared equals "R" squared left brace, "x" less than 1 , right brace Has graph. To audio trace, press ALT+T.y−a22+x−1−R·cosb22=R2x<1