1,334 prompts matching "Test me under exam conditions on complex numbers"
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Practice: Turning a minor into a cofactor with the sign rule
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Learn: The order of the steps in inverting a 3 by 3 matrix
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Practice: The parallelogram law of forces
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Learn: The resultant of two perpendicular forces
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Quiz: The magnitude of the resultant of several coplanar forces
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Learn: A space diagram and a force diagram drawn side by side
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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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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Spot My Mistake: The probability of exactly r successes in n trials
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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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Practice: Using the normal tables when the z-score is negative
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Practice: The magnitude of the sum of two vectors
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Learn: The unit vectors i, j and k
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Practice: Equating real and imaginary parts to find two unknowns
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