1,334 prompts matching "Quiz: A negative index on a fraction, and turning it upside down"
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Explain Back: The forces acting on a body hanging from two strings
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Practice: Why the forces must sum to nought in two perpendicular directions
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Practice: Finding an unknown force from a closed polygon
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Explain Back: Locating the point of concurrence on a diagram
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Practice: Resolving three forces in two perpendicular directions
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Worked Example: Matching each force to the sine of the angle opposite it
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Practice: Using a binomial expansion to approximate a number
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Explain Back: The binomial probability formula
I have just studied the binomial probability formula in my SS3 Further Mathematics class.
Practice: The variance of a binomial distribution as npq
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Explain Back: Converting a value to a z-score
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Worked Example: Finding a value from a given probability by working backwards
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Worked Example: Testing two vectors for perpendicularity
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Practice: Deciding whether a point lies on a given line
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Worked Example: The powers of i, and the cycle they follow
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Practice: Equating real and imaginary parts to find two unknowns
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Practice: The argument of a complex number in the second or third quadrant
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Practice: Converting a complex number from polar form back to a plus bi
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Practice: Why complex roots of a real quadratic come in conjugate pairs
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Explain Back: Differentiating one over x from first principles
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Practice: Differentiating sin x and cos x
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