924 prompts matching "Solve 2cos^2(x) - cos(x) - 1 = 0 for 0 to 360 degrees"
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Practice: Factorising a quadratic with a common factor taken out first
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Learn: Making the coefficient of x squared equal to one first
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Explain Back: An answer left in surd form after completing the square
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Learn: Deriving the quadratic formula by completing the square
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Quiz: A negative value of b in the quadratic formula
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Practice: Giving the roots correct to two decimal places
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Explain Back: Leaving the roots of a quadratic in surd form
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Spot My Mistake: What the formula gives when the discriminant is nought
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Practice: Forming an equation from a given sum and product
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Worked Example: The identity linking alpha squared plus beta squared to the sum and product
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Practice: The value of alpha to the fourth plus beta to the fourth
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Worked Example: Substituting into the quadratic and tidying up
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Learn: Forming the quadratic that decides where a line meets a curve
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Worked Example: The discriminant used as the test for intersection
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Quiz: The condition for two points of intersection
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Spot My Mistake: Finding the values of c for which a line is a tangent
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Explain Back: Evaluating P of 2 for a given polynomial
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Final Revision: The degree of the product of two polynomials
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Worked Example: The division algorithm for polynomials
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Common Mistakes: The degree of the quotient and of the remainder
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