1,315 prompts matching "Proving the sum formula by pairing the terms"
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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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Show All Working: Arrangements of the letters of a given word
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Show All Working: Counting the handshakes, or the lines joining n points
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Spot My Mistake: Solving an equation by first applying a Pythagorean identity
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Final Revision: Losing solutions by dividing through by cos x
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Show All Working: Reading the solutions of a trigonometric equation off a graph
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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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Show All Working: The effect on the standard deviation of adding a constant to every value
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Show All Working: Replacing two parallel forces by a single resultant
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Show All Working: The time at which two bodies are nearest one another
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Learn: Two particles joined by a light inextensible string over a smooth pulley
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Show All Working: A lift, and the person standing in it
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Show All Working: The angle at which a body just begins to slide
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Show All Working: A body in a vertical circle, and the tension at the top
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Show All Working: The work done in stretching an elastic string
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Spot my mistake: Assuming a quadratic with a negative discriminant has no roots at all
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Testing whether a relation is a function
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The vertical line test
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