where R = {(x, y): 0 ≤ x ≤ 1, 0 ≤ y ≤ a}.
a. Evaluate I for a = 1. (Hint: Use polar coordinates.)
b. Evaluate I for arbitrary a > 0.
c. Let a → ∞ in part (b) to find I over the infinite strip R = {(x, y): 0 ≤ x ≤ 1, 0 ≤ y ≤ ∞}.
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