1,332 prompts matching "IGCSE Additional Maths Y11: Proving an identity by working from the harder side"
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Final Revision: Proving that root 2 is irrational
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Show All Working: Solving a logarithmic equation and rejecting the invalid root
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Show All Working: Solving a quadratic by completing the square
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Common Mistakes: Proving that a quadratic expression is positive for every real x
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Final Revision: Solving a disguised quadratic by substitution
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Worked Example: Evaluating a polynomial by substitution
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Show All Working: Solving a cubic equation by factorisation
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Worked Example: Solving a quadratic inequality by sketching the parabola
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Show All Working: Solving a pair of simultaneous linear inequalities
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Show All Working: Arrangements of the letters of a given word
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Spot My Mistake: The identity that n choose r equals n choose n minus r
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Show All Working: Counting the handshakes, or the lines joining n points
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Show All Working: The half angle formulae and the t-substitution
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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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Final Revision: Losing solutions by dividing through by cos x
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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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Show All Working: The intersection of a circle and a straight line
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Show All Working: The rectangular hyperbola xy equals c squared
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Final Revision: The focus-directrix definition shared by all the conics
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