Transcript
Page 1: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value

Unit 23

Trig identities

Objectives

On completion of this unit you should understand:

1. The trig ratios for angles from to .

2. The ratios of the special angles , and .

3. The use of the trig ratios and .

4. The use of the compound angle formulae.

5. The use of the double angle formulae.

Written and produced by © Stafford College 1993

Cook, M. and Rimmer, H. (1993),

Stafford College, Earl Street, Stafford, ST16 2QR

Page 2: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 3: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 4: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 5: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 6: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 7: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 8: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 9: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 10: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 11: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 12: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value
Page 13: Trig identitiesIf sinA = 4/5 and A is an acute angle, find the value of cosA. (An acute angle lies between 00 900). If cosA = -5113 and A lies between 1800 and 2700 find the value

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