1,334 prompts matching "Teach me the dot product of two vectors"
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Worked Example: Forming the determinant Dy by replacing the second column
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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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Quiz: Checking an inverse by multiplying to get the identity
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Spot My Mistake: Why the inverse must be applied on the correct side
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Practice: What a singular coefficient matrix says about the equations
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Quiz: Solving three simultaneous equations with the inverse matrix
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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: Why one component vanishes when the direction is chosen well
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WAEC Prep: The forces on a body resting on a rough horizontal plane
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WAEC Prep: The forces on a body suspended by a single string
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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 order in which the forces are drawn round the triangle
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WAEC Prep: The three unknowns a rigid body problem usually carries
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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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WAEC Prep: Calculating a moment as force times perpendicular distance
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WAEC Prep: The conditions for a particle under three forces to be in equilibrium
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