7. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
8. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
a sec 2 d
2
a sec 2
secd
9. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
a sec 2 d
2
a sec 2
secd
logsec tan c
10. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
a sec 2 d
2 a2 x2
a sec 2 x
secd
logsec tan c
a
11. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
a sec 2 d
2 a2 x2
a sec 2 x
secd
logsec tan c
a
a2 x2 x
log
c
a a
12. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
a sec 2 d
2 a2 x2
a sec 2 x
secd
logsec tan c
a
a2 x2 x
log
c
a a
log a 2 x 2 x log a c
13. 1
e.g. i 2 dx x a tan
a x 2
a sec 2 d dx a sec 2 d
2
a a 2 tan 2
a sec 2 d
2 a2 x2
a sec 2 x
secd
logsec tan c
a
a2 x2 x
log
c
a a
log a 2 x 2 x log a c
log a2 x2 x c