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Really need Help identify DR

Really need Help identify DR-example-1
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User Qamnott
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|DS|^2+|KS|^2=|DK|^2\\ |DS|^2+15^2=17^2\\ |DS|^2+225=289\\ |DS|^2=64\\ |DS|=8\\\\ |DR|=2|DS|=2\cdot8=16
Really need Help identify DR-example-1
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User Akshin Jalilov
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