“…Despite being a very recent idea, we have already found numerous works on this subject. For example, in [20][21][22] we find some fundamental properties of it, stability of fractional differential equations were addressed in [23][24][25], in [26] is studied stochastic differential equations, and a more general form of the derivative, with dependence of an arbitrary kernel, was considered in [27][28][29]. However, with regard to the calculus of variations, no study has yet been carried out and with this work, we intend to contribute to this area.…”