1,334 prompts matching "Teach me multiplying two complex numbers in the form a plus bi"
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Quiz: The complement of a set within a stated universal set
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Spot My Mistake: De Morgan's law that the complement of a union is the intersection of the complements
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Final Revision: The power set, and how many subsets a set of n elements has
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Explain Back: Finding the identity element of a binary operation
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Spot My Mistake: Finding the inverse of an element under a binary operation
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Quiz: Solving an index equation by writing both sides to the same base
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Worked Example: The discriminant, and what each of its three cases means
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Common Mistakes: Symmetric functions when the three roots of a cubic are involved
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Final Revision: Checking a symmetric-function answer by solving the equation outright
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Show All Working: Arrangements of the letters of a given word
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Show All Working: Solving a cos x plus b sin x equals c by the R method
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Common Mistakes: Giving the general solution of a trigonometric equation
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Show All Working: Reading the solutions of a trigonometric equation off a graph
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Worked Example: The midpoint formula applied to a given segment
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Worked Example: The parametric form of a point on a parabola
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WAEC Prep: The standard deviation of grouped data using an assumed mean
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Quiz: The principle of moments for a body in equilibrium
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WAEC Prep: A couple, and why its moment is the same about every point
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Final Revision: A ladder leaning against a wall, and the moments acting on it
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Common Mistakes: What becomes of the tension when the string goes slack
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