1,478 prompts matching "IGCSE practice: Why the line need not touch any data point"
Worked example: The reference angle for an angle beyond 90 degrees
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Practice set: Reading a value off a trigonometric graph
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Worked example: Finding the height of a mast from its angle of elevation
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Worked example: Using the power law to simplify a logarithmic expression
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Worked example: The shape of a logarithmic graph
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Practice set: Adding and subtracting in modular arithmetic
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Worked example: Bringing a negative number into the right residue class
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Worked example: The number of elements in a set
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Worked example: The formula for the number in a union
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Practice set: Conjunction, and when it is true
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Worked example: The converse, inverse and contrapositive
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Teach me: How many rows a truth table needs
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Worked example: Changing the subject when the letter occurs on both sides
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Practice set: Joint variation with two variables
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Worked example: Using the constant to predict a further value
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Worked example: Substituting into the quadratic formula carefully
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Exam timing: A timed set of formula and completing-the-square questions
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Worked example: The perimeter of a segment
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Worked example: The slant height in a cone's surface area
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Worked example: The frustum of a pyramid
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