1,333 prompts matching "Laws of indices with three different bases in one line"
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Worked Example: Forming the determinant Dy by replacing the second column
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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Practice: What a singular coefficient matrix says about the equations
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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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Explain Back: The order in which the forces are drawn round the triangle
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Practice: Why the forces must sum to nought in two perpendicular directions
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Explain Back: Why the total moment about any point must be nought
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Practice: Finding an unknown force from a closed polygon
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Practice: Limiting friction, and the greatest value it can reach
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Explain Back: A probability distribution table for a discrete random variable
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Practice: Using a binomial expansion to approximate a number
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Explain Back: The binomial probability formula
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Explain Back: Finding n and p from a given mean and variance
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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Explain Back: Converting a value to a z-score
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Worked Example: Finding a value from a given probability by working backwards
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Practice: Using the normal tables when the z-score is negative
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Worked Example: The continuity correction when approximating a discrete distribution
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