$$(59)^{2} + (12)^{2} = (?)^{2} + 600$$
Expression : $$(59)^{2} + (12)^{2} = (?)^{2} + 600$$
=> $$3481 + 144 = (?)^2 + 600$$
=> $$(?)^2 = 3625 - 600 = 3025$$
=> $$? = \sqrt{3025} = 55$$
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