**TI83F* AppVariable file 12/24/08, 18:34 uGLA213usnav 568F4C949E5C4185AD1586A3FF413DF4GLA213.GLA2131   amplitude\amplitude:For functions in the form y = a sin b [ or y = a cos b [, the amplitude is | a |. angle of depression!angle of depression:The angle between a horizontal line and the line of sight from the observer to an object at a lower level. angle of elevationangle of elevation:The angle between a horizontal line and the line of sight from the observer to an object at a higher level. arccosine functionFarccosine function:The inverse of y = cos x, written as x = arccos y. arcsine function Darcsine function:The inverse of y = sin x, written as x = arcsin y. arctangent function Garctangent function:The inverse of y = tan x, written as x = arctan y. central angle Bcentral angle:An angle with a vertex at the center of the circle. circular function:circular function:A function defined using a unit circle.  cosecantpcosecant:For any angle, with measure , a point P(x, y) on its terminal side, r = (x^2 + y^2),csc = r / y.  cosineocosine:For any angle, with measure , a point P(x, y) on its terminal side, r = (x^2 + y^2), cos = x / r.   cotangentqcotangent:For any angle, with measure ,a point P(x, y) on its terminal side, r = (x^2 + y^2),cot = x / y.  coterminal anglesTcoterminal angles:Two angles in standard position that have the same terminal side.  cycle3cycle:One complete pattern of a periodic function.  frequency8frequency:The number of cycles in a given unit of time.  initial side!(initial side:The fixed ray of an angle. Law of CosinesLaw of Cosines:Let ABC be any triangle with a, b, and c representing the measures of sides, and opposite angles with measures A, B, and C, respectively. Then the following equations are true.a^2 = b^2 + c^2 - 2bc cosAb^2 = a^2 + c^2 - 2ac cosBc^2 = a^2 + b^2 - 2ab cosC.  Law of SinesLaw of Sines:Let ABC be any triangle with a, b, and c representing the measures of sides opposite angles with measurements A, B, and C, respectively.Then,sin A/a = sin B/b = sinC/c. midlinenmidline:A horizontal axis used as the reference line about which the graph of a periodic function oscillates. periodAperiod:The least possible value of for which f(x) = f(x + ). periodic functionperiodic function:A function is called periodic if there is a number such that f(x) = f(x + ) for all x in the domain of the function.  phase shiftBphase shift:A horizontal translation of a trigonometric function. principal valuesRprincipal values:The values in the restricted domains of trigonometric functions. quadrantal anglecquadrantal angle:An angle in standard position whose terminal side coincides with one of the axes. radianwradian:The measure of an angle [ in standard position whose rays intercept an arc of length 1 unit on the unit circle. reciprocal functionsQreciprocal functions:Trigonometric functions that are reciprocals of each other. reference anglemreference angle:The acute angle formed by the terminal side of an angle in standard position and the x-axis. secantsecant:In a right triangle with acute angle A, the secant of A = (the measure of the hypotenuse) / (the measure of the adjacent side). sinelsine:For any angle, with measure , a point P(x, y) on its terminal side, r = (x^2 + y^2),sin = y / r. solving a triangleksolving a triangle:Using given measures tofind all unknown side lengths and angle measures of a triangle. standard position}standard position:An angle positioned so that its vertex is at the origin and its initial side is along the positive x-axis. tangent>tangent:A line that intersects a circle at exactly one point.   terminal side!?terminal side:A ray of an angle that rotates about the center.! trigonometric functiontrigonometric function:For any angle, with measure , a point P(x, y) on its terminal side,r = (x2 + y2) , the trigonometric functions of are as follows.sin = y / r cos = x / r tan =y / xcsc = r / y sec = r / x cot = x / y." trigonometric ratioCtrigonometric ratio:Compares the side lengths of a right triangle.#  trigonometry^trigonometry:The study of the relationshipsbetween the angles and sides of a right triangle.$  unit circle/!\unit circle:A circle of radius 1 unit whose center is at the origin of a coordinate system.% vertical shiftQvertical shift:When graphs of trigonometricfunctions are translated vertically.9`@  F2IHGH AHN0@@|O%@`@@D@@jJ@LUQ@@HUP@@fT@@ @L!RJR*RILL(@@ @((@ 1@TJ@@T2@@J@J@ @1@@@@D@@%L"@HTP@$Y& @Q$ @3P@@@@@@ @P@ NsAF$HDC@8`@ )*D*IL *)HDD*eFFJ J J  DIc`@A  *P 0*P@RTkh@@(A@K B"J D'J !"2@P@8p@TP@ @`@`@!D@"@$ R@$ PR@$ R@  "@ P   @`@0  @ @HFH@ @HH8`>|ϟ>| ` AP& DA Ji♓$`J BRdAM `0 0 0`` 0@(f!RL4q* T!*0U2b ɑZJ` >|ϟ>|P