7ced8705b0f61d8223eff2e3409c701ebf524fabc24f964aef1e26a850ed5f67fd71477fb1bd7fdcf3c06a77a3c4f10e847e4c2d03

14번 문제에서 a=2root(a^2-x^2)이 왜 되는건가요

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