1,304 prompts matching "Practice: Why an identity element must work from both sides"
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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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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WAEC Prep: The inverse of a 3 by 3 matrix from its adjoint and its determinant
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WAEC Prep: Mass, and how it differs from weight
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Worked Example: The units of mass, and the SI unit
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Worked Example: The direction of the resultant of two forces
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WAEC Prep: Why one component vanishes when the direction is chosen well
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Explain Back: The forces acting on a body hanging from two strings
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WAEC Prep: Labelling the triangle of forces from the space diagram
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Worked Example: Using the sine rule on the triangle of forces
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Explain Back: The units of a moment, and why they are newton metres
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Explain Back: A particle hanging from two strings set at different angles
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WAEC Prep: Lami's theorem derived from the triangle of forces
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WAEC Prep: A lamp hanging from two wires, solved by Lami's theorem
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Worked Example: Matching each force to the sine of the angle opposite it
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Worked Example: Finding a particular term of a binomial expansion
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Explain Back: Finding n and p from a given mean and variance
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WAEC Prep: Why the mean and the variance of a Poisson distribution are equal
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