Yes, it's the whole problemDid you include the wholwe problem for the 1st image. If you let f(t)=1, then you'll see that this is not an identity.
I thought about t=1/yAh, they are not two separate problems!
So what substitution can you make so that the limits 1 to x becomes 1/x to 1 (or the other way around) or even 1 to x to become 1 to 1/x?
Can we see your work with that substitution?I thought about t=1/y
Yes, its working. Thanks a lootCan we see your work with that substitution?