a^2 + b^2 + c^2 = (a+b+c)^2 - 2(ab+bс + ca) = 5^2 - 2 * 5 = 25 - 10 = 15
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a^2 + b^2 + c^2 = (a+b+c)^2 - 2(ab+bс + ca) = 5^2 - 2 * 5 = 25 - 10 = 15