Example 1
For the integral, (a) identify u and du and (b) integrate by substitution.
Example 2
For the integral, (a) identify u and du and (b) integrate by substitution.
Example 3
For the integral, (a) identify u and du and (b) integrate by substitution.
Example 4
For the integral, (a) identify u and du and (b) integrate by substitution.
Example 5
For the integral, (a) identify u and du and (b) integrate by substitution.
Example 6
Integrate by substitution.
Example 7
Integrate by substitution.
Example 8
Integrate by substitution.
Example 9
Integrate by substitution.
but we don't know how to integrate 
. So
Example 10
Integrate by substitution.
Example 11
Integrate.
Example 12
Integrate.
, so we multiply the integrand by 
and the integral by 2:
Example 13
Integrate.
Example 14
Integrate.
.
Example 15
Integrate.
, but we can fix that.