We are executive members who pays $100/year. We also get cash back for every purchase and we pretty much get the membership fee back every year. We are a family of four and we buy most of our home supplies from Costco plus other stuffs. We love Costco but you have to know what you are buying.
Undefined is a term used when a mathematical result has no meaning. More precisely, undefined values occur when an expression is evaluated for input values outside of its domain. ( 1 if no complex numbers) ( 2 if no complex numbers) ( units in radians, no complex infinity)
Key Points. 1  Defined media is made from constituents that are completely understood. 2  Undefined media has some part of which is not entirely defined. 3  The presence of extracts from animals or other microbes makes a media undefined as the entire chemical composition of extracts are not completely known.