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.
There are also 3 reciprocal trigonometric functions: cosecant (csc), secant (sec), and cotangent (cot). These functions are the reciprocals of sine, cosine, and tangent, respectively: ; ; . Finally, each of the trigonometric functions we have covered so far has a corresponding inverse function.he sine, cosine, and tangent of an angle are defined as follows: ; ; . EXAMPLE 3: Evaluate the sine, cosine, and tangent of the angles and oe Ã¸ in the triangle at. Left, first use The pythagorean theorem to find that the hypotenuse has a length of. 5