1,334 prompts matching "Learn: Why a surd is never left in the denominator"
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Spot My Mistake: Squaring a 2 by 2 matrix
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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Spot My Mistake: Orders that make a product possible one way round but not the other
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Practice: The sign pattern of the cofactors in a 3 by 3 determinant
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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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Practice: Turning a minor into a cofactor with the sign rule
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Practice: What a singular coefficient matrix says about the equations
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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: Checking the solution of three equations by substitution
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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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Spot My Mistake: The greatest and the least resultant of two given forces
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Practice: Choosing the most convenient pair of directions to resolve along
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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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Worked Example: Drawing the polygon of forces to scale
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Practice: Limiting friction, and the greatest value it can reach
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