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" ... or a in the algebra course and exclude sin x or tan x. All alike are pieces of symbolism invented for the description and interpretation of facts of the external world. Each represents a typical kind of function. "
The Teaching of Algebra (including Trigonometry) - 19. lappuse
autors: Sir Thomas Percy Nunn, Thomas Percy Nunn - 1914 - 616 lapas
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The Teaching of Algebra (including Trigonometry)

Sir Thomas Percy Nunn - 1919 - 616 lapas
...soon as the symbols of the trigonometrical ratios are recognized as capable of entering into formulae and of being manipulated they should be regarded as...principle, except the invalid principle of formal segrega2 * tion, upon which we can include the study of x" or of a* in the algebra course and exclude...
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