1,321 prompts matching "Factorising fully, and knowing when to stop"
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Quiz: Checking a 3 by 3 inverse by multiplication
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Spot My Mistake: Why the inverse must be applied on the correct side
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Quiz: Solving three simultaneous equations with the inverse matrix
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Quiz: Why mass stays the same wherever the body is taken
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Spot My Mistake: Compounding three forces acting at one point
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Quiz: Recovering the original force from its two components
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Quiz: The magnitude of the resultant of several coplanar forces
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Quiz: The coefficient of friction between two surfaces
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Spot My Mistake: Why friction does not depend on the area of contact
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Spot My Mistake: The moment of a force whose line of action is not perpendicular
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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Spot My Mistake: The probability of exactly r successes in n trials
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Quiz: The situations a Poisson distribution models
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Quiz: The probability in the upper tail of a normal distribution
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Quiz: Subtracting one complex number from another
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Spot My Mistake: Dividing one complex number by another using the conjugate
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Quiz: The argument of a complex number
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Quiz: Writing a complex number in polar form
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Spot My Mistake: Deriving a multiple angle formula from de Moivre's theorem
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