1,202 prompts matching "Why a conditional and its contrapositive are equivalent"
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Final Revision: Losing solutions by dividing through by cos x
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Practice: The effect of a in y equals a sin x
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Spot My Mistake: The effect of c in y equals sin x plus c
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Show All Working: Reading the solutions of a trigonometric equation off a graph
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Common Mistakes: Sketching two trigonometric curves on the same axes to find where they meet
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Quiz: The gradient of the line through two points
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Practice: The equation of a line through a point with a given gradient
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Spot My Mistake: The general form ax plus by plus c equals nought
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Show All Working: Proving two given lines perpendicular from their gradients
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Common Mistakes: The angle between two lines found from their gradients
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Final Revision: The perpendicular distance from a point to a line
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Practice: The equation of a circle on a given diameter
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Spot My Mistake: The equation of the tangent to a circle at a point on it
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Common Mistakes: The condition for a line to be a tangent to a circle
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Final Revision: The equation of the circle through three given points
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Quiz: The equation of the tangent to a parabola
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Spot My Mistake: The foci of an ellipse
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Common Mistakes: Identifying a conic from a general second-degree equation
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Quiz: The semi-interquartile range
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Practice: The mean deviation from the mean
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