1,334 prompts matching "A sign error in the formula, and how to catch it"
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Common Mistakes: The condition for a line to be a tangent to a circle
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Practice: The ellipse in standard form, and its two axes
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Worked Example: The sign convention for clockwise and anticlockwise moments
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Spot My Mistake: Two particles on a pulley at the top of an inclined plane
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Spot My Mistake: The least force needed to move a body up a rough incline
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Practice: The maximum speed and the maximum acceleration in simple harmonic motion
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Spot My Mistake: The time taken to move between two points in simple harmonic motion
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Practice: The difference between an elastic string and a spring in compression
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Spot my mistake: Assuming AB and BA give the same matrix
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Spot my mistake: Negating the leading diagonal and swapping the other two entries when inverting a 2 by 2 matrix
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Spot my mistake: Treating the kilogram and the kilogram weight as the same unit
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Spot my mistake: Adding the magnitudes of concurrent forces to get the magnitude of their resultant
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Spot my mistake: Assuming moments may only be taken about the pivot and never about another point
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Spot my mistake: Treating the variance of a binomial distribution as its standard deviation
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Spot my mistake: Treating the dot product of two vectors as another vector
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Spot my mistake: Differentiating a product by multiplying the derivatives of its two factors
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Spot my mistake: Applying the power rule to the integral of one over x
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Showing that fg(x) is not the same as gf(x)
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Find the equation command word: circle through the origin
I am in SS 3. Give me an exam question phrased 'find the equation of the circle', where th
Find the coefficient command word: binomial expansion
I am in SS 3. Set me an exam question phrased 'find the coefficient of x^n', for a binomia