


TrigonometryCalculators and Trigonometric FunctionsCalculators can be used to compute the values of trig functions at angles that are not necessarily special ( 0º, 30º = π/6, 45º = π/4, 60º = π/6, 90º = π/2). Always make sure your calculator is set at the right mode (DEG or RAD) Note: On some scientific calculators, to obtain the value of π you press the π key. On others, you press the EXP. Before continuing on, test your calculator to find which key gives you the value of π = 3.14159265359… ExerciseExerciseNote that for any x, If you are given the value of a trig function you can find the angle by using the inverse of the trig function. gives a value θ in such that gives a value θ in such that gives a value θ in such that
Example Find θ between and π so that sin θ = 0.3 By a calculator, This is in the first quadrant:
To get the value in the second quadrant we calculate θ = π – 0.3047 =2.837 Exercise 6. << Trigonometry Functions on General Angles  Trigonometry Index  Graphs of Trig Functions >> 