When you replace s(a) and s(t) with and , you get a lot of cancellation. Remember the identity .
They're getting you ready for derivatives - the limit you are calculating is just the derivative of s(t) at a.
- Hollywood
When you replace s(a) and s(t) with and , you get a lot of cancellation. Remember the identity .
They're getting you ready for derivatives - the limit you are calculating is just the derivative of s(t) at a.
- Hollywood