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Question:

The area of the region described by A = (x, y): x² + y² ≤ 1 and y² ≤ 1 - x is:

π/2 + 2/3

π/2 - 1/3

π/2 + 4/3

π/2 - 1/3

Solution:

A = (1/2) * π + 2∫₀¹ √(1 - x) dx = π/2 + 4/3