1,334 prompts matching "Quiz me on why negation reverses every truth value"
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Explain Back: Why the order of the letters matters in a matrix product
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Quiz: Solving AX equals B and XA equals B by different routes
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Explain Back: The rule that the transpose of a product reverses the order
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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WAEC Prep: Expanding a 3 by 3 determinant along the first row
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WAEC Prep: Setting out the coefficient determinant for two simultaneous equations
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: Why the cofactor signs alternate
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Quiz: Checking an inverse by multiplying to get the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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WAEC Prep: Writing two simultaneous equations as a single matrix equation
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WAEC Prep: Writing three simultaneous equations as a single matrix equation
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Worked Example: Checking the solution of three equations by substitution
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WAEC Prep: The newton, and how it is defined
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Worked Example: The weight of a body as mass times g
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WAEC Prep: The resultant of two forces acting at the same point
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Worked Example: The direction of the resultant of two forces
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WAEC Prep: Resolving a force into horizontal and vertical components
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WAEC Prep: Summing the components of several concurrent forces
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