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Quadrantal Angles At 0 we use the coordinate____________ At 90 we use the coordinate___________ At 180 we use the coordinate__________ At 270 we use the coordinate__________ Evaluate. 1. sin 0 = _____________ 2. cos 0 = ______________ sin 90 = _____________ cos 90 =______________ sin 180 = _____________ cos 180 = ______________ sin 270 = _____________ cos 270 = ______________ sin 360 = _____________ cos 360 = ______________ 3. tan 0= _____________ 4. csc 0 = ______________ tan 90= _____________ csc 90 = ______________ tan 180= _____________ csc 180 = _____________ tan 270= _____________ csc 270 = _____________ tan 360= _____________ csc 360 = _____________ 5. sec 0 = ______________ 6. cot 0 = _______________ sec 90 = ______________ cot 90 = _______________ sec 180 = ______________ cot 180 = ______________ sec 270 = ______________ cot 270 = ______________ sec 360 = ______________ cot 360 = ______________ REFERENCE ANGLES AND SPECIAL TRIANGLES I. Draw the triangles used to determine the trigonometric values for: A. 45 B. 30 or 60 II. Identify the coordinates used to determine the trig functions of quadrantal angles. r = ________ III. Complete the formula for the trigonometric functions using x, y, and r. 1. sin = _________ 2. cos = _________ 3. tan = _________ 4. csc = __________ 5. sec = __________ 4. cot = _________ IV. Evaluate the following: 1. cos 180 = ______ 2. tan 45 = _________ 3. sin 0 = _________ 4. sec 60 = _______ 5. sec 90 = ________ 6. cot 60 = ________ 7. sin 30 = _______ 8. sin 45= _________ 9. cos 45 = _______ V. Give the reference angle for each angle. 1. 330 = ______ 2. 315 = _______ 3. 240 = _______ 4. -210 = ______ VI. Evaluate. 1. sin 150 2. cos (-60) 3. cos 120 4. sin (-315) 5. cot 300 6. sec 330 7. tan 225 8. csc 240 9. sin 135 10. tan 210