1,333 prompts matching "Pi and root 2 as the two best-known irrational numbers"
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Explain Back: Keeping track of the nine entries when multiplying 3 by 3 matrices
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WAEC Prep: The difference between pre-multiplying and post-multiplying by a matrix
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WAEC Prep: The identity matrix, and what it does in a product
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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Worked Example: A singular matrix, and why it has no inverse
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WAEC Prep: Reading the order of a matrix as rows by columns
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Explain Back: The order of the answer when two matrices are multiplied
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WAEC Prep: The determinant of a 2 by 2 matrix as ad minus bc
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WAEC Prep: Expanding a 3 by 3 determinant along the first row
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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WAEC Prep: The adjoint as the transpose of the matrix of cofactors
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WAEC Prep: The inverse of a 2 by 2 matrix as one over the determinant times the adjoint
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WAEC Prep: How long the inverse of a 3 by 3 matrix takes, and how to shorten it
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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: Reading the solution off the product of the inverse and the constants
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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WAEC Prep: Mass, and how it differs from weight
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Learn: Inertia, and what mass actually measures
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Quiz: Why mass stays the same wherever the body is taken
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