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a small group of people or items selected by researchers from within a larger population
a trigonometric rule that states that the ratio of any side of a triangle and the sin of the...
the limit of the average gradient as the change in x tends towards zero.
a sequence in which each term is calculated by multiplying the previous term by a common ratio,...
the notation (standardised set of rules and symbols) that allows us to describe an interval (of...
in any right-angled triangle, the square on the hypotenuse equals the sum of the squares on the...