Problem: Consider the following integral:$I(x) = \int_1^\infty g(t) e^{-xf(t)}dt; g(x)=\frac{85}{-t+t^6}; f(t) = (\ln(t-1))^2 + \cos(\frac{\pi}{2} t) + 1$In the limit$x \rightarrow \infty$, find approximate behavior of the integral up to and including the leading order in x. Provide your answer in a $\boxed{}$ latex environment.
Solution: $\boxed{I(x) \approx \frac{85}{62}\sqrt{\frac{2\pi}{(2+\frac{\pi^2}{4})x}}}$