1,320 prompts matching "IGCSE Additional Maths Y11: The identity one plus tan squared equals sec squared"
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Quiz: The point about which the total moment of a set of forces vanishes
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Explain Back: Locating the point of concurrence on a diagram
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Spot My Mistake: Using concurrence to find the direction of an unknown third force
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Worked Example: Matching each force to the sine of the angle opposite it
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Learn: Finding two unknown forces by Lami's theorem
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Spot My Mistake: When Lami's theorem may be used, and when it may not
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Learn: The expectation of a discrete random variable
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Learn: Finding the coefficient of a stated power in an expansion
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Explain Back: The binomial probability formula
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Spot My Mistake: The probability of exactly r successes in n trials
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Quiz: The situations a Poisson distribution models
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Worked Example: The probability of no events at all in a Poisson distribution
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Learn: The standard deviation of a binomial distribution
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Quiz: The standard deviation of a Poisson distribution
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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Learn: The mean, median and mode of a normal distribution
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Quiz: The area under the normal curve, and what it represents
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Spot My Mistake: Reading a probability from the standard normal table
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Learn: The probability that a normal variable lies between two values
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