Power Rule: A rule used to differentiate functions involving powers. In this case, using power rule with sqrt(u) would give us (1/2)sqrt(u).
Chain Rule: A rule used for differentiating composite functions. If there are other functions wrapped around sqrt(u), chain rule helps find their derivatives as well.
Inverse Function: The opposite operation of square rooting, which involves squaring (u^2). When combined with square rooting again (√(u^2)), it returns the original value of u.