1,315 prompts matching "Proving the sum formula by pairing the terms"
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Quiz: Solving an index equation by writing both sides to the same base
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WAEC Prep: The change of base formula for logarithms
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Learn: The sum and the product of the roots read from the coefficients
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Show All Working: Solving a quadratic by completing the square
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Learn: Finding alpha squared plus beta squared from the sum and product
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Practice: Finding alpha minus beta from the sum and the product
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Final Revision: Checking a symmetric-function answer by solving the equation outright
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Learn: The sum of the roots of a cubic read from its coefficients
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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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Learn: Solving a linear inequality, and reversing the sign on dividing by a negative
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Worked Example: Solving a quadratic inequality by sketching the parabola
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Quiz: The compound angle formula for sine of A plus B
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Practice: The compound angle formula for cosine of A minus B
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Explain Back: The compound angle formula for tan of A plus B
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Spot My Mistake: The double angle formula for sine
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WAEC Prep: The three forms of the double angle formula for cosine
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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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Worked Example: The midpoint formula applied to a given segment
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Spot My Mistake: The general form ax plus by plus c equals nought
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WAEC Prep: Proving two given lines parallel from their gradients
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