1,334 prompts matching "Teach me adding and subtracting complex numbers"
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WAEC Prep: Setting out Cramer's rule for three simultaneous equations
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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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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WAEC Prep: When the matrix method is worth the work for three unknowns
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Practice: Comparing the inverse method with elimination for three equations
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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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Quiz: Why mass stays the same wherever the body is taken
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WAEC Prep: The difference between a kilogram and a kilogram weight
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WAEC Prep: The newton, and how it is defined
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WAEC Prep: The resultant of two forces acting at the same point
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Spot My Mistake: The greatest and the least resultant of two given forces
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WAEC Prep: Resolving a force into horizontal and vertical components
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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WAEC Prep: Friction, and the direction in which it acts
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Practice: Limiting friction, and the greatest value it can reach
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