Verify the formula using any method.
for .
Proof. First, we use integration by parts, letting
This gives us
Now, we bring the back to the left since this is the same integral that we started with. This gives us,
Verify the formula using any method.
for .
Proof. First, we use integration by parts, letting
This gives us
Now, we bring the back to the left since this is the same integral that we started with. This gives us,