1,333 prompts matching "Checking an inverse by working the operation both ways"
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Practice: Arrangements when some of the objects are identical
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Learn: The meaning of n choose r, and how to evaluate it
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Learn: The Pythagorean identity, sin squared plus cos squared equals one
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Practice: The compound angle formula for cosine of A minus B
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Worked Example: Solving cos x equals a negative value, and finding both solutions
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Practice: Solving an equation of the form sin of 2x equals a given value
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Spot My Mistake: Solving an equation by first applying a Pythagorean identity
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WAEC Prep: Solving an equation by first applying a double angle formula
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Learn: The shape, period and range of the sine curve
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Learn: The distance between two points
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Spot My Mistake: The general form ax plus by plus c equals nought
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Learn: The parabola y squared equals 4ax, with its focus and directrix
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Practice: The ellipse in standard form, and its two axes
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Final Revision: The focus-directrix definition shared by all the conics
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Learn: The range, and why it is a weak measure of spread
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Practice: The mean deviation from the mean
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Learn: The moment of a force about a point, and its units
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Learn: The velocity of one body relative to another
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Practice: The triangle of velocities for a boat crossing a river
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Learn: Resolving the weight along and perpendicular to an inclined plane
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