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The "Complete Class Notes" are the physical (or digital) manifestation of his live classroom sessions. Unlike standard textbooks, these notes are dynamic, raw, and structured exactly as he teaches on the whiteboard. Focus on Identities and Height & Distance
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Explanation: Given $\frac1x + \frac1y + \frac1z = 0 \implies \fracxy+yz+zxxyz = 0 \implies xy+yz+zx=0$. Expression: $\fracx^2+y^2+z^2(x+y+z)^2$. Since $xy+yz+zx=0$, $x^2+y^2+z^2 = (x+y+z)^2 - 0 = (x+y+z)^2$. Value = $\frac(x+y+z)^2(x+y+z)^2 = 1$.