I have to show that
So far, I have
My sol'n book then says this is equal to
I understand that for the second term they are just finding the length, but I don't understand how
.
Can anyone explain the math behind that?
I have to show that
So far, I have
My sol'n book then says this is equal to
I understand that for the second term they are just finding the length, but I don't understand how
.
Can anyone explain the math behind that?