Posted by tom on .
Find the derivative of y with respect to x,t, or theta, as appropriate.
y = ∫ ^(√4x) ^basedown√x (ln(t^2)) dt

cal 
Steve,
since there is no theta, it's certainly not appropriate.
Since y is a function of x, there is no derivative for t.
See wikipedia's nice article on differentiation under the integral for the technique.