1,331 prompts matching "Which form of the sum formula to use when r is less than one"
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Practice: Choosing the most convenient pair of directions to resolve along
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WAEC Prep: Summing the components of several concurrent forces
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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Practice: Why the forces must sum to nought in two perpendicular directions
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Worked Example: Drawing the polygon of forces to scale
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Explain Back: The units of a moment, and why they are newton metres
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WAEC Prep: The resultant moment of a couple and a force together
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WAEC Prep: The total moment of two forces about the same point
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Worked Example: The total moment of three parallel forces about one end
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WAEC Prep: The triangle of forces and concurrence taken together
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Spot My Mistake: Using concurrence to find the direction of an unknown third force
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Worked Example: Matching each force to the sine of the angle opposite it
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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WAEC Prep: The binomial expansion of a plus b all to the power n
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WAEC Prep: The Poisson formula, and what lambda stands for
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WAEC Prep: Using the mean of a Poisson distribution to find a probability
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Practice: The components of a vector given its magnitude and direction
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WAEC Prep: The position of a point in space written as a vector
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Quiz: The direction cosines of a vector in three dimensions
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WAEC Prep: The magnitude of a vector after multiplication by a scalar
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