1,320 prompts matching "IGCSE Additional Maths Y11: The identity one plus tan squared equals sec squared"
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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Worked Example: Taking a common factor out of a matrix
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Quiz: Solving AX equals B and XA equals B by different routes
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Spot My Mistake: A symmetric matrix, equal to its own transpose
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Worked Example: A singular matrix, and why it has no inverse
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Explain Back: Solving a matrix equation containing both a sum and a product
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Quiz: Finding an unknown entry from a stated matrix equation
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Worked Example: What a determinant of nought means for a 2 by 2 matrix
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Learn: Solving two simultaneous equations by Cramer's rule
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Quiz: Checking a 3 by 3 inverse by multiplication
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Learn: Inertia, and what mass actually measures
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Learn: Converting a weight given in kilogram-force into newtons
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Explain Back: Showing that a system of concurrent forces is in equilibrium
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Learn: A space diagram and a force diagram drawn side by side
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Learn: What an unclosed polygon of forces tells you
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Explain Back: A particle hanging from two strings set at different angles
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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Explain Back: A probability distribution table for a discrete random variable
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