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  2. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    In particular, in these two identities an asymmetry appears that is not seen in the case of sums of finitely many angles: in each product, there are only finitely many sine factors but there are cofinitely many cosine factors. Terms with infinitely many sine factors would necessarily be equal to zero. When only finitely many of the angles are ...

  3. List of open-source software for mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_open-source...

    The precise uses and capabilities of these systems differ greatly from one system to another, yet their purpose remains the same: manipulation of symbolic equations. Computer algebra systems often include facilities for graphing equations and provide a programming language for the users' own procedures.

  4. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Many texts write φ = tan −1 ⁠ y / x ⁠ instead of φ = atan2(y, x), but the first equation needs adjustment when x ≤ 0. This is because for any real x and y, not both zero, the angles of the vectors (x, y) and (−x, −y) differ by π radians, but have the identical value of tan φ = ⁠ y / x ⁠.

  5. Group of rational points on the unit circle - Wikipedia

    en.wikipedia.org/wiki/Group_of_rational_points...

    Consider a primitive right triangle, that is, with integer side lengths a, b, c, with c the hypotenuse, such that the sides have no common factor larger than 1. Then on the unit circle there exists the rational point ( a / c , b / c ), which, in the complex plane , is just a / c + ib / c , where i is the imaginary unit .

  6. Fermat number - Wikipedia

    en.wikipedia.org/wiki/Fermat_number

    From the second equation, we can deduce Goldbach's theorem (named after Christian Goldbach): no two Fermat numbers share a common integer factor greater than 1. To see this, suppose that 0 ≤ i < j and F i and F j have a common factor a > 1. Then a divides both and F j; hence a divides their difference, 2.

  7. Dottie number - Wikipedia

    en.wikipedia.org/wiki/Dottie_number

    In mathematics, the Dottie number or the cosine constant is a constant that is the unique real root of the equation ⁡ =, where the argument of is in radians. The decimal expansion of the Dottie number is given by: D = 0.739 085 133 215 160 641 655 312 087 673... (sequence A003957 in the OEIS).

  8. Bunyakovsky conjecture - Wikipedia

    en.wikipedia.org/wiki/Bunyakovsky_conjecture

    It can be shown [citation needed] that if for all k, there exists an integer n > 1 with () prime, then for all k, there are infinitely many natural numbers n with () prime. The following sequence gives the smallest natural number n > 1 such that Φ k ( n ) {\displaystyle \Phi _{k}(n)} is prime, for k = 1 , 2 , 3 , … {\displaystyle k=1,2,3 ...

  9. Underdetermined system - Wikipedia

    en.wikipedia.org/wiki/Underdetermined_system

    The main property of linear underdetermined systems, of having either no solution or infinitely many, extends to systems of polynomial equations in the following way. A system of polynomial equations which has fewer equations than unknowns is said to be underdetermined .