Special+Angles+and+Primary+Trigonometric+Functions

Special Angles and Primary Trigonometric Functions November 4, 2011 Natasha Wood

Special Angles

30 ° = p /6 45 ° = p /4 60 ° = p /3

Unit circle= circle of Radius

sin x =y cos x =x tan x =y/x

Example 1 – Evaluate

Sin3 p /4 = Ö 2/2 Cos 11 p /6 = Ö 3/2 Tan 5 p /4 = 1

Example 2 – Solve 0<x<2 p

Sinx= - Ö 2/2 = 5 p /4, 7 p /4 Cosx= Ö 3/2 = 11 p /6, p /6 Tanx= - Ö 3 = 2 p /3, 5 p /3

Y=sinx



Y=cosx

Y=tanx