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3rd/3ways: sum Show 1+2+3+...+n = n(1+n)/2
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logic Idempotent law show x=xVx
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"baby" fact: exp e^(ix)
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2 ways: 𝖎𝖓𝖙𝖊𝖌𝖗𝖆𝖑 ∫x^5 √(1+x^3) dx
count comb: How many subsets does {{{118},{{18,19,20,21,...,118}},{{{118}}} }} have?
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Solve x(x-1)dy/dx - (x-2)y=x^3(2x-1) via Integrating Facto[IF]
Solve √(2x-5) -√(x-2) = 2
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UT Austin: sq root integral ∫1/((√x) (1+ √x))dx
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2nd/3ways: Laplace Show that ...