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Chapter 10

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10.3 Simplified Form for Radicals

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... 11.Find the circulation of the field F = (x-y)i+x j around the circle r(t)= cost i+sint j ; 0≤t≤2π. 12.Find the equation whose roots is greater by unity than the roots of the equation x3-5x2+6x-3=0. 13.Solve the equation x4-12x3+49x2-78x+40 =0 by removing its second term. 14.Solve the equation x3-5x ...
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... Let f (x) = xn + an−1 xn−1 + . . . a0 be a polynomial with integer coefficients. A number r such that f (r) = 0 is called a root. We’ll mainly be interested in rational roots. In this case we have: Proposition 1. (The rational root test) Any rational solution of f (x) = 0 is automatically an integer ...
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Root of unity



In mathematics, a root of unity, occasionally called a de Moivre number, is any complex number that gives 1 when raised to some positive integer power n. Roots of unity are used in many branches of mathematics, and are especially important in number theory, the theory of group characters, and the discrete Fourier transform.In field theory and ring theory the notion of root of unity also applies to any ring with a multiplicative identity element. Any algebraically closed field has exactly n nth roots of unity, if n is not divisible by the characteristic of the field.
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