A name server is a computer hardware or software server that implements a network service for providing responses to queries against a directory service.It translates an often humanly-meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. name server indicates that its response is authoritative by setting the Authoritative Answer (AA) bit in the response to a query on a name for which it is authoritative. Name servers providing answers for which they are not authoritative (for example, name servers for parent zones) do not set the AA bit.
Trigonometry (from Greek trigÅnon, triangle and metron, measure) is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.
Quadratic functions are functions in which the 2nd power, or square, is the highest to which the unknown quantity or variable is raised.. The function y=x2 or f(x) = x2 is a quadratic function, and is the parent graph for all other quadratic functions. The shortcut to graphing the function f(x) = x2 is to start at the point (0, 0) (the origin) and mark the point, called the vertex. Note that the point (0, 0) is the vertex of the parent function only. In calculus, this point is called a critical point, and some pre-calculus teachers also use that terminology.