Expression 7: left parenthesis, negative StartFraction, "d" to the 4th power "l" plus 2 thirds "d" squared "l" cubed plus StartNestedFraction, "l" to the 5th power NestedOver 5 , EndNestedFraction minus "r" to the 4th power "l" Over "r" to the 4th power , EndFraction plus StartFraction, "d" to the 4th power "n" plus 2 thirds "d" squared "n" cubed plus StartNestedFraction, "n" to the 5th power NestedOver 5 , EndNestedFraction minus "r" to the 4th power "n" Over "r" to the 4th power , EndFraction , right parenthesis Has graph. To audio trace, press ALT+T.−d4l+23d2l3+l55−r4lr4+d4n+23d2n3+n55−r4nr4
7
Expression 8: left parenthesis, StartFraction, "l" left parenthesis, 10 "l" squared left parenthesis, "d" squared minus "r" squared , right parenthesis plus 15 left parenthesis, "d" squared minus "r" squared , right parenthesis squared plus 3 "l" to the 4th power , right parenthesis Over 15 "r" to the 4th power , EndFraction minus StartFraction, "n" left parenthesis, 10 "n" squared left parenthesis, "d" squared minus "r" squared , right parenthesis plus 15 left parenthesis, "d" squared minus "r" squared , right parenthesis squared plus 3 "n" to the 4th power , right parenthesis Over 15 "r" to the 4th power , EndFraction , right parenthesis Has graph. To audio trace, press ALT+T.l10l2d2−r2+15d2−r22+3l415r4−n10n2d2−r2+15d2−r22+3n415r4
8
Expression 9: "f" equals 0f=0
negative 10−10
1010
9
Expression 10: "r" squared StartFraction, tan to the negative 1st power left parenthesis, StartNestedFraction, "l" NestedOver "d" , EndNestedFraction , right parenthesis minus tan to the negative 1st power left parenthesis, StartNestedFraction, "n" NestedOver "d" , EndNestedFraction , right parenthesis Over "d" , EndFraction Has graph. To audio trace, press ALT+T.r2tan−1ld−tan−1ndd
10
Expression 11: "r" left parenthesis, log left parenthesis, StartRoot, "d" squared plus "l" squared , EndRoot plus "l" , right parenthesis minus log left parenthesis, StartRoot, "d" squared plus "n" squared , EndRoot plus "n" , right parenthesis , right parenthesis Has graph. To audio trace, press ALT+T.rlogd2+l2+l−logd2+n2+n