3. (6) t results
x
If t tan
2
2t 1 t2
then sin x , cos x
1 t 2
1 t 2
4. (6) t results
x
If t tan
2
2t 1 t2
then sin x , cos x
1 t 2
1 t 2
dt 1 2 x
sec
dx 2 2
1 2 x
1 tan
2 2
1 t 2
1
2
5. (6) t results
x
If t tan
2
2t 1 t2
then sin x , cos x
1 t 2
1 t 2
dt 1 2 x
sec
dx 2 2
1 2 x
1 tan
2 2
1 t 2
1
2
dx 2
dt 1 t 2
2dt
dx
1 t 2
7. dx
e.g. t tan
x
7 6 cos x 2
2dt
dx
1 t 2
8. dx
e.g. t tan
x
7 6 cos x 2
2dt 2dt
dx
1 t 2 1 t 2
1 t 2
7 6
1 t
2
9. dx
e.g. t tan
x
7 6 cos x 2
2dt 2dt
dx
1 t 2 1 t 2
1 t 2
7 6
1 t
2
2dt
7 7t 2 6 6t 2
2dt
13 t 2
10. dx
e.g. t tan
x
7 6 cos x 2
2dt 2dt
dx
1 t 2 1 t 2
1 t 2
7 6
1 t
2
2dt
7 7t 2 6 6t 2
2dt
13 t 2
2 1 t
tan c
13 13
11. dx
e.g. t tan
x
7 6 cos x 2
2dt 2dt
dx
1 t 2 1 t 2
1 t 2
7 6
1 t
2
2dt
7 7t 2 6 6t 2
2dt
13 t 2
2 1 t
tan c
13 13
x
2 tan
tan 1 2c
13 13
13. If t tan x dt
sec 2 x
dx
1 tan 2 x
1 t2
14. If t tan x dt
sec 2 x dx
1
dx dt 1 t 2
1 tan 2 x dt
dx
1 t2 1 t2
15. If t tan x dt
sec 2 x dx
1
dx dt 1 t 2
1 tan 2 x dt
dx
1 t2 1 t2
In General :
x
If t tan
a
16. If t tan x dt
sec 2 x dx
1
dx dt 1 t 2
1 tan 2 x dt
dx
1 t2 1 t2
In General :
x dt 1 2 x
If t tan sec
a dx a a
1 x
1 tan 2
a a
1 t 2
1
a
17. If t tan x dt
sec 2 x dx
1
dx dt 1 t 2
1 tan 2 x dt
dx
1 t2 1 t2
In General :
x dt 1 2 x dx a
If t tan sec
a dx a a dt 1 t 2
1 x adt
1 tan 2 dx
a a 1 t2
1 t 2
1
a
18. If t tan x dt
sec 2 x dx
1
dx dt 1 t 2
1 tan 2 x dt
dx
1 t2 1 t2
In General :
x dt 1 2 x dx a
If t tan sec
a dx a a dt 1 t 2
1 x adt
1 tan 2 dx
a a 1 t2
1 t 2
1
a