1,310 prompts matching "Practice: An operation that is not commutative, with a counter-example"
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Quiz: Solving three simultaneous equations with the inverse matrix
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Practice: The value of g used in Nigerian examination papers
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Spot My Mistake: The greatest and the least resultant of two given forces
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Practice: The direction of the resultant of several coplanar forces
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Explain Back: Showing that a system of concurrent forces is in equilibrium
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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Practice: Finding an unknown force from a closed polygon
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Practice: Limiting friction, and the greatest value it can reach
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Spot My Mistake: Using concurrence to find the direction of an unknown third force
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Explain Back: A probability distribution table for a discrete random variable
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Practice: Using a binomial expansion to approximate a number
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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Spot My Mistake: Reading a probability from the standard normal table
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Practice: The components of a vector given its magnitude and direction
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Worked Example: The distance between two points in three dimensions
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Practice: The dot product as the magnitudes times the cosine of the angle
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Practice: Equating real and imaginary parts to find two unknowns
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Practice: The sum of a complex number and its conjugate
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