1,329 prompts matching "What an inverse element is"
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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Worked Example: Forming the determinant Dy by replacing the second column
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Worked Example: The units of mass, and the SI unit
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Practice: The value of g used in Nigerian examination papers
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Spot My Mistake: Compounding three forces acting at one point
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Worked Example: The direction of the resultant of two forces
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Quiz: The magnitude of the resultant of several coplanar forces
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Practice: The direction of the resultant of several coplanar forces
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Worked Example: Using the sine rule on the triangle of forces
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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: Why friction does not depend on the area of contact
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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