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  2. List of trigonometric identities - Wikipedia

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

    Terms with infinitely many sine factors would necessarily be equal to zero. When only finitely many of the angles are nonzero then only finitely many of the terms on the right side are nonzero because all but finitely many sine factors vanish. Furthermore, in each term all but finitely many of the cosine factors are unity.

  3. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Euler's formula states that, for any real number x, one has = ⁡ + ⁡, where e is the base of the natural logarithm, i is the imaginary unit, and cos and sin are the trigonometric functions cosine and sine respectively. This complex exponential function is sometimes denoted cis x ("cosine plus i sine").

  4. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    If the denominator, b, is multiplied by additional factors of 2, the sine and cosine can be derived with the half-angle formulas. For example, 22.5° (π /8 rad) is half of 45°, so its sine and cosine are: [11]

  5. Infinite product - Wikipedia

    en.wikipedia.org/wiki/Infinite_product

    The same criterion applies to products of arbitrary complex numbers (including negative reals) if the logarithm is understood as a fixed branch of logarithm which satisfies ⁡ =, with the proviso that the infinite product diverges when infinitely many a n fall outside the domain of , whereas finitely many such a n can be ignored in the sum.

  6. Dottie number - Wikipedia

    en.wikipedia.org/wiki/Dottie_number

    The generalised case ⁡ = for a complex variable has infinitely many roots, but unlike the Dottie number, they are not attracting fixed points. The solution of quadrisection of circle into four parts of the same area with chords coming from the same point can be expressed via Dottie number.

  7. Hadamard factorization theorem - Wikipedia

    en.wikipedia.org/wiki/Hadamard_factorization_theorem

    Otherwise, has infinitely many roots. This is the tricky part and requires splitting into two cases. This is the tricky part and requires splitting into two cases. First show that g ≤ floor ( ρ ) {\displaystyle g\leq {\text{floor}}(\rho )} , then show that ρ ≤ g + 1 {\displaystyle \rho \leq g+1} .

  8. Uses of trigonometry - Wikipedia

    en.wikipedia.org/wiki/Uses_of_trigonometry

    The value of the sum is −1, because 42 has an odd number of prime factors and none of them is repeated: 42 = 2 × 3 × 7. (If there had been an even number of non-repeated factors then the sum would have been 1; if there had been any repeated prime factors (e.g., 60 = 2 × 2 × 3 × 5) then the sum would have been 0; the sum is the Möbius ...

  9. Harmonic series (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(mathematics)

    Because it is a divergent series, it should be interpreted as a formal sum, an abstract mathematical expression combining the unit fractions, rather than as something that can be evaluated to a numeric value. There are many different proofs of the divergence of the harmonic series, surveyed in a 2006 paper by S. J. Kifowit and T. A. Stamps. [13]