1,323 prompts matching "The sum of a geometric progression with a negative common ratio"
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Spot My Mistake: The identity that n choose r equals n choose n minus r
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WAEC Prep: Pascal's triangle and the combination numbers in it
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Show All Working: Counting the handshakes, or the lines joining n points
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Learn: The Pythagorean identity, sin squared plus cos squared equals one
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Spot My Mistake: The double angle formula for sine
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Show All Working: The half angle formulae and the t-substitution
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Worked Example: Solving cos x equals a negative value, and finding both solutions
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Show All Working: Solving a cos x plus b sin x equals c by the R method
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Quiz: The tangent curve and its asymptotes
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Learn: The distance between two points
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Spot My Mistake: The general form ax plus by plus c equals nought
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WAEC Prep: Proving two given lines parallel from their gradients
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Show All Working: Proving two given lines perpendicular from their gradients
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Quiz: Finding the centre and the radius from the general equation
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WAEC Prep: The hyperbola in standard form, and its asymptotes
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Show All Working: The rectangular hyperbola xy equals c squared
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Common Mistakes: Identifying a conic from a general second-degree equation
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Quiz: The semi-interquartile range
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Spot My Mistake: The point at which a loaded beam will tip about its support
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WAEC Prep: A couple, and why its moment is the same about every point
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