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Discrete mathematics: prove ∑-(k=1)^n▒〖k^2=(n (n+1)(n+2))/6〗 for all n≥1? Find the exact value by using a half-angle identity. cos (-π/8)? Longest side is 2" longer than the middle side.the shortest side is 14" shorter than the middle. if the perim is 60" whats the length of ea? Enginering drawing a.w.boundy? What is the difference between evaluating a function and solving a function?

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