1,334 prompts matching "Teach me how to determine the validity of an argument"
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Quiz: The complement of a set within a stated universal set
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Explain Back: The symmetric difference of two sets
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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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WAEC Prep: The number of elements in the union of two sets
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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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Explain Back: Rationalising a denominator of the form a plus root b using the conjugate
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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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Spot My Mistake: The factor theorem for a divisor of the form ax minus b
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Worked Example: The sum of the products of the roots of a cubic taken two at a time
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Worked Example: The number of arrangements of n different objects in a row
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Quiz: The number of arrangements of r objects chosen from n
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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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Spot My Mistake: The equation of the tangent to a circle at a point on it
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Show All Working: The intersection of a circle and a straight line
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Worked Example: The parametric form of a point on a parabola
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Quiz: The equation of the tangent to a parabola
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WAEC Prep: The standard deviation of grouped data using an assumed mean
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