9.1.13 Double integrals

Problem: Find the double integral of the given function

f (x, y)

in the given area

G

\begin{array}{l} f (x, y) = e^{- {(\frac{x}{a})}^{2} - {(\frac{y}{b})}^{2}} \\ G : {(\frac{x}{a})}^{2} + {(\frac{y}{b})}^{2} \geq 1, \iint_{G} f (x, y) d x d y - ? \end{array}