Find the combination that minimizes a cost function

Find the combination that minimizes a cost function

References

Reference NO 1

http://stackoverflow.com/questions/15205928/find-the-combination-that-minimizes-a-cost-function

Reference NO 2

http://www.ticoneva.com/econ/econ100a_sp08/section9.pdf

Reference NO 3

http://www.econ.unavarra.es/~mcasares/ch07psetsol.doc

Reference NO 4

http://www.slideshare.net/salasvelasco/microeconomics-cost-functions

Reference NO 5

http://answers.mheducation.com/business/economics/business-economics/production-and-cost-long-run

Reference NO 6

http://au.answers.yahoo.com/question/index?qid=20110611073200AAiqBlB

Reference NO 7

http://my.ilstu.edu/~mswalber/ECO240/Workbooks/CostMin.xls

Reference NO 8

http://www.fep.up.pt/docentes/moutinho/micro/Besanko-ch07.pdf