1,334 prompts matching "Spot my mistake dividing two complex numbers in modulus-argument form"
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Explain Back: The symmetric difference of two sets
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Common Mistakes: Showing that intersection distributes over union
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Common Mistakes: A binary operation defined by arithmetic modulo n
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Quiz: Multiplying two surds and simplifying the result
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WAEC Prep: Comparing the sizes of two surds without a calculator
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Show All Working: Expressing a number in the form a root b
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Common Mistakes: Solving an equation in which the unknown sits under a root
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Common Mistakes: Solving an exponential equation using logarithms
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WAEC Prep: Forming an equation whose roots are each two more than the original
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Common Mistakes: Proving that a quadratic expression is positive for every real x
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Common Mistakes: Symmetric functions when the three roots of a cubic are involved
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Practice: Finding the third root of a cubic when two are known
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Common Mistakes: Three roots in geometric progression in a cubic
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Learn: Solving a linear inequality, and reversing the sign on dividing by a negative
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Worked Example: The number of arrangements of n different objects in a row
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Explain Back: Arrangements in which two particular objects must stay together
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Final Revision: Counting the number plates or codes that can be formed under a rule
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WAEC Prep: Pascal's triangle and the combination numbers in it
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Common Mistakes: Selections in which at least one of a kind must appear
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Common Mistakes: Expressing a cos x plus b sin x in the form R cos of x minus alpha
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