1,334 prompts matching "A sign error in the formula, and how to catch it"
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Learn: Solving sin x equals a given value between 0 and 360 degrees
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Worked Example: Solving cos x equals a negative value, and finding both solutions
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Common Mistakes: Giving the general solution of a trigonometric equation
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Learn: The distance between two points
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Quiz: The gradient of the line through two points
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WAEC Prep: Proving two given lines parallel from their gradients
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Common Mistakes: The angle between two lines found from their gradients
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Learn: The equation of a circle with its centre at the origin
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Worked Example: The equation of a circle with a given centre and radius
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WAEC Prep: The length of the tangent from an external point
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Final Revision: The equation of the circle through three given points
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Learn: The parabola y squared equals 4ax, with its focus and directrix
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Quiz: The equation of the tangent to a parabola
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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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Quiz: The semi-interquartile range
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Common Mistakes: The coefficient of variation, for comparing two sets
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Final Revision: Reading the quartiles off a cumulative frequency curve
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Quiz: The principle of moments for a body in equilibrium
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Show All Working: Replacing two parallel forces by a single resultant
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