1,331 prompts matching "find the gradient of y = x^3 - 4x at the point where x = 2"
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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Practice: What a singular coefficient matrix says about the equations
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Quiz: Solving three simultaneous equations with the inverse matrix
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Practice: Comparing the inverse method with elimination for three equations
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Practice: Limiting friction, and the greatest value it can reach
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Quiz: The situations a Poisson distribution models
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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Quiz: The area under the normal curve, and what it represents
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Learn: The probability that a normal variable lies between two values
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Practice: Using the normal tables when the z-score is negative
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Spot My Mistake: When the normal distribution may approximate the binomial
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Worked Example: The continuity correction when approximating a discrete distribution
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Spot My Mistake: Dividing one complex number by another using the conjugate
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Worked Example: The quotient rule for differentiation
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Quiz: Using the initial conditions to fix the constants in a kinematics problem
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Practice: The sign convention for displacement, velocity and acceleration
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Explain Back: The greatest height reached by a body thrown upwards
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Practice: The rank correlation coefficient
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