Consider the potential (V=-V_{0} cos (a x)left(V_{0}>0 ight)) with a small initial condition (left(x_{0}

Consider the potential \(V=-V_{0} \cos (a x)\left(V_{0}>0\right)\) with a small initial condition \(\left(x_{0}<\pi /(2 a)\right)\). Calculate the WKB approximation in the path integral.