x^2 + y^2 - 2ay + a^2 + z^2 - 2az + a^2 = 2a^2 \quad \Rightarrow \quad 2a^2 - 2ay - 2az + 2a^2 = 2a^2 \quad \Rightarrow \quad 2a^2 - 2ay - 2az + 2a^2 - 2a^2 = 0 \quad \Rightarrow \quad ay + az = a^2 \quad \Rightarrow \quad y + z = a - Crosslake
Mar 01, 2026
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