The combined constructions subjected to an action of expanding loads and consisting separate sections are examined. Each the mentioned has its own rigidity. These parts may be made from same or various materials. materials can anisotropic isotropic, homogeneous inhomogeneous. under study have round scheme they considered as circular disks with piecewise thickness. In places conjugation disks’ t...

Keywords: Trigonometric functions Hurwitz zeta function Legendre chi function Lerch zeta function Bernoulli polynomials Euler polynomials a b s t r a c t In this sequel to our recent note [D. Cvijović, Values of the derivatives of the cotangent at rational multiples of π, Appl. Math. Lett. it is shown, in a unified manner, by making use of some basic properties of certain special functions, suc...