Columbia U: 3rd way Evaluate the indefinite integral ∫1/(1+e^x) dx

Law students before graduation vs. after graduation

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logic Idempotent law show x=xVx

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MPPET 1996 Hindustan: trig integral ∫ sin^2(x) -cos^2(x)/(sin^2(x) cos^2(x)) dx

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Pantun Melayu [Buah cempedak di luar pagar]

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A box contains 8 blue & 6 red socks. What is the number of ways that 2 socks can be drawn ...

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Pantun Melayu [Sorong papan tarik papan]

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Always ZERO

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Review: Arithmetic Series a+(a+d)+(a+2d)+...+(a+(n-1)d)=

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trig integral ∫1/(sin(ax) cos(ax)) dx

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Was it a luxury to eat pickled vegetables and tofu at that time?

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The seats designed for homeless people are really thoughtful.

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2nd way: trig integral ∫(sec(x) tan(x))/(sec^2(x)-sec(x)) dx

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trig integral ∫tan^n(x) dx where n is EVEN via Reduction formula

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2 ways: trig integral ∫1/(2+cos^2(x)) dx

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5 ways: trig Derivative of sin^2(x)

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#2 2011 MIT Integration Bee Qualifying Exam

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2010 Raytheon MATHCOUNTS National Competition

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#19 2011 MIT Integration Bee Qualifying Exam

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2nd/3 ways: How many chords can be drawn through 21 points on a circle?

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#14 2011 MIT Integration Bee Qualifying Exam

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