1,334 prompts matching "The sum of an arithmetic progression with a negative common difference"
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WAEC Prep: The length of the tangent from an external point
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Quiz: The equation of the tangent to a parabola
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Spot My Mistake: The foci of an ellipse
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Learn: The range, and why it is a weak measure of spread
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Spot My Mistake: The standard deviation of an ungrouped set of data
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Learn: The moment of a force about a point, and its units
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Learn: The velocity of one body relative to another
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Spot My Mistake: Two particles on a pulley at the top of an inclined plane
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WAEC Prep: Limiting equilibrium, with a body on the point of sliding
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Final Revision: The speed of a body when it reaches the foot of an incline
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Final Revision: The period and the frequency of circular motion
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WAEC Prep: The simple pendulum as an example of simple harmonic motion
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Learn: Hooke's law, and what the modulus of elasticity means
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Spot my mistake: Assuming AB and BA give the same matrix
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Spot my mistake: Adding the magnitudes of concurrent forces to get the magnitude of their resultant
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Spot my mistake: Assuming moments may only be taken about the pivot and never about another point
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Spot my mistake: Treating the rth term of a binomial expansion as the one carrying the rth power
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Spot my mistake: Treating the variance of a binomial distribution as its standard deviation
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Spot my mistake: Treating the dot product of two vectors as another vector
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Spot my mistake: Reporting an area computed below the x-axis as a negative distance travelled
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