The unit circle X2 +Y2= 1 Definition of trigonometric functions sin t = y cos t = x tan t= y/x csc t = 1/y sec t = 1/x cot t = x/y
Special Values of Trigonometric Functions
Angle Degrees 0 30 45 60 90 120 135 150 180 210 225 240 270 300 315 330 360
Radian