In this paper, we extend the identity established in \cite{2} for preinvex functions. Using this novel identity we establish some new Cebysev type inequalities involving functions of two independent variable whose mixed derivatives are coordinated $(h_{1},h_{2})$preinvex.
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Bibtex  @araştırma makalesi { konuralpjournalmath330398,
journal = {Konuralp Journal of Mathematics},
issn = {},
eissn = {2147625X},
address = {Mehmet Zeki SARIKAYA},
year = {2018},
volume = {6},
pages = {76  83},
doi = {},
title = {Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated \$\\left( h\_\{1\},h\_\{2\}\\right) \$Preinvex},
key = {cite},
author = {Meftah, Badreddine}
} 
APA  Meftah, B . (2018). Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex. Konuralp Journal of Mathematics, 6 (1), 7683. Retrieved from http://dergipark.gov.tr/konuralpjournalmath/issue/31478/330398 
MLA  Meftah, B . "Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex". Konuralp Journal of Mathematics 6 (2018): 7683 <http://dergipark.gov.tr/konuralpjournalmath/issue/31478/330398> 
Chicago  Meftah, B . "Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex". Konuralp Journal of Mathematics 6 (2018): 7683 
RIS  TY  JOUR T1  Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex AU  Badreddine Meftah Y1  2018 PY  2018 N1  DO  T2  Konuralp Journal of Mathematics JF  Journal JO  JOR SP  76 EP  83 VL  6 IS  1 SN  2147625X M3  UR  Y2  2018 ER  
EndNote  %0 Konuralp Journal of Mathematics Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex %A Badreddine Meftah %T Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex %D 2018 %J Konuralp Journal of Mathematics %P 2147625X %V 6 %N 1 %R %U 
ISNAD  Meftah, Badreddine . "Two Dimensional Cebysev Type Inequalities for Functions Whose Second Derivatives are Coordinated $\left( h_{1},h_{2}\right) $Preinvex". Konuralp Journal of Mathematics 6 / 1 (Nisan 2018): 7683. 