1,334 prompts matching "A sign error in the formula, and how to catch it"
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Final Revision: Solving a disguised quadratic by substitution
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Quiz: Finding alpha cubed plus beta cubed
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Learn: The sum of the roots of a cubic read from its coefficients
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Quiz: The product of the roots of a cubic
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WAEC Prep: Finding a coefficient of a cubic given one of its roots
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Common Mistakes: Three roots in geometric progression in a cubic
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WAEC Prep: Writing a solution set in interval notation
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Common Mistakes: The range of values of x for which an expression stays positive
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Quiz: The number of arrangements of r objects chosen from n
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Common Mistakes: Arrangements restricted at the first or the last place
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Quiz: Choosing a committee of r people from n
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Common Mistakes: Selections in which at least one of a kind must appear
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Final Revision: Proving an identity by working on one side only
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Final Revision: Losing solutions by dividing through by cos x
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WAEC Prep: A phase shift in y equals sin of x minus d
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Common Mistakes: Identifying a conic from a general second-degree equation
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Quiz: Relative velocity when the two motions are at right angles
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Common Mistakes: The relative displacement of two bodies after a given time
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Learn: Two particles joined by a light inextensible string over a smooth pulley
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WAEC Prep: The conical pendulum
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