Which of the formulas below can be used to evaluate the following integral?
∫4e²ˣ/36+4e²ˣdx

a. ∫1/(u+a)²du=-1/u+a
b. ∫1/(u+a)(u+b)du=1/b-1ln(a+u/b+u)+C
c. ∫ua²+u²du=1/2ln|a²+u2|
d. ∫√x-u=2/3(u-a)³/²+C