On ( p , q ) -Sine and ( p , q ) -Cosine Fubini Polynomials

: In recent years, ( p , q ) -special polynomials, such as ( p , q ) -Euler, ( p , q ) -Genocchi, ( p , q ) Bernoulli, and ( p , q ) -Frobenius-Euler, have been studied and investigated by many mathematicians, as well physicists. It is important that any polynomial have explicit formulas, symmetric identities, summation formulas, and relations with other polynomials. In this work, the ( p , q ) -sine and ( p , q ) cosine Fubini polynomials are introduced and multifarious abovementioned properties for these polynomials are derived by utilizing some series manipulation methods. ( p , q ) -derivative operator rules and ( p , q ) -integral representations for the ( p , q ) -sine and ( p , q ) -cosine Fubini polynomials are also given. Moreover, several correlations related to both the ( p , q ) -Bernoulli, Euler, and Genocchi polynomials and the ( p , q ) -Stirling numbers of the second kind are developed.

Special polynomials have important roles in several subjects of mathematics, engineering, and theoretical physics. The problems arising in mathematics, engineering and mathematical physics are framed in terms of differential equations. Most of these equations can only be treated by utilizing diverse families of special polynomials that give novel viewpoints of mathematical analysis. Moreover, they are widely used in computational models of engineering and scientific problems. In mathematics, these special polynomials yield the derivation of other useful identities in a fairly straightforward way and help to consider new families of special polynomials. Fubini-type polynomials appear in combinatorial mathematics and play an important role in the theory and applications of mathematics; hence, many number theory and combinatorics experts have extensively studied their properties and obtained a series of interesting results (see [6,13,14]). In addition, it is important that any polynomial has explicit formulas, symmetric identities, summation formulas, and relations with other polynomials. In this paper, our main aim is to consider (p, q)-sine and (p, q)-cosine Fubini polynomials and derive some of their properties and relations using series manipulation methods. The results derived in this work extend many earlier results for the several extensions of Fubini polynomials.
In this work, we make use of the following notations: The (p, q)-numbers [m] p,q are defined as follows: Hence, it is observed that (p, q)-numbers and q-numbers are different; namely, one cannot derive (p, q)-numbers just by changing q by q/p in the definition of q-numbers. Again, when p = 1, the (p, q)-numbers reduce to the q-numbers (see [4,5,9,11]). The (p, q)-extension of the derivative operator of a function g with respect to t is given by and (D p,q g(0)) = g (0), provided that g is differentiable at 0. This operator satisfies the following properties D p,q (g(t) f (t)) = f (qt)D p,q g(t) + g(p(t))D p,q f (t) (2) and The (p, q)-factorial numbers [m] p,q ! and the(p, q)-binomial coefficients ( m r ) p,q are provided by The (p, q)-power basis is defined by (t + a)(pt + aq) · · · (p m−2 t + aq m−2 )(p m−1 t + aq m−1 ) = t ⊕ p,q a m (m ≥ 1) and also has the following expansion The (p, q)-exponential functions, e p,q (t) and E p,q (t), are introduced by which have the following relationships e p −1 q −1 (t) = E p,q (t) and e p,q (t)E p,q (−t) = 1.
These functions hold the following properties D p,q e p,q (t) = e p,q (pt) and D p,q E p,q (t) = E p,q (qt).
The (p, q)-analog of the usual definite integral is defined [9] by From (5), it is observed that From (9), the (p, q)-sine function and the (p, q)-cosine function are given [12] by The (p, q)-Bernoulli, (p, q)-Euler, and (p, q)-Genocchi polynomials are introduced as follows (see [3]): [2] p,q e p,q (tz) e p,q (z) and [2] p,q ze p,q (tz) e p,q (z) When t = 0, the polynomials given above reduce to their corresponding numbers, shown respectively by B m (p, q), E m (p, q), and G m (p, q) for m ∈ N 0 .
The generating function of geometric polynomials (or Fubini polynomials) is provided as follows (see [13,14]): which implies where the numbers S 2 (m, r) are the Stirling numbers of the second kind provided by (see [15,16]) Upon setting t = 1, we attain F m (1) := F m , which denotes the corresponding Fubini numbers.

On (p, q)-Sine and (p, q)-Cosine Fubini Polynomials
The Taylor series expansions of the functions e tz sin(wz) and e tz cos(wz) are presented as given below (see [17]) where Note that the symbol . is the greatest integer function.
In the recent studies, Sadjang and Duran [12] considered (p, q)-generalizations of S m (t, w) and C m (t, w): where and Now, we give our main definition as follows.
Therefore, we omit the details of the proofs.
Proof. If we apply the (p, q)-derivative operator to the exponential generating function (22) with respect to t, by utilizing (7), we see that which implies (32). The others can be readily proved similarly.
(see [9]), using Theorem 5, (22) and (23), we investigate which completes the proof of the theorem. Now, we state the following summation formula.
Here are summation formulae for the (p, q)-sine Fubini polynomials and (p, q)-cosine Fubini polynomials.
Proof. From (11) and (22), we consider that which means the claimed correlation (37). The proof of the other correlation (38) can be done similarly to the proof of the correlation (37). hold for m ≥ 0 and q, p ∈ C in conjunction with 0 < |q| < |p| ≤ 1.
Proof. From (13) and (22), we investigate sin p,q (wz)e p,q (tz) 1 − γ(e p,q (z) − 1) = e p,q (z) + 1 z[2] p,q z [2] p,q e p,q (z) + 1 sin p,q (wz)e p,q (tz) 1 − γ(e p,q (z) − 1) In this work, (p, q)-sine Fubini polynomials and (p, q)-cosine Fubini polynomials have been introduced and multifarious summation formulae and relationships for these polynomials have been derived by utilizing some series manipulation methods. Furthermore, (p, q)-derivative operator rules and (p, q)-integral representations for the (p, q)-sine Fubini polynomials and (p, q)-cosine Fubini polynomials have been provided. Moreover, diverse correlations related to both the (p, q)-Stirling numbers and the (p, q)-Euler, Bernoulli, and Genocchi polynomials have been developed. When q → p = 1, all acquired results in this work reduce to classical results for sine-Fubini and cosine-Fubini polynomials. The results obtained in this paper are also generalizations of the many earlier (p, q)-results, some of which involve related references in [6].
We think that this idea of constructing new (p, q)-polynomial sequences has possible applications in physics, science, and engineering, as well as in mathematics, such as in combinatorics, integral transforms, approximation theory, and analytic number theory; see [1][2][3][4][5][6][7][8][9][10][11][12] and the references cited therein. As one of our future research projects, we would like to continue and extend this idea in various directions.