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Double Angle and Half Angle Matching. You may use the choices more than once or not at all. __________ 1. 2 cos2 10° β 1 A. sin π __________ 2. 2 sin 35° cos 35° B. cos 4π __________ 3. 2 tan 25° 1βtan2 25° C. cos 20° __________ 4. 4 tan 25° 1βtan2 25° D. cos 35° __________ 5. 1 β 2 sin2 15° E. cos 8π __________ 6. 2 sin 2 cos 2 F. 5 cos 2π __________ 7. cos2 (4π) β sin2(4π) G. 2 tan 50° __________ 8. 2 cos2 15° β 1 H. sin 70° __________ 9. 2 cos2 (3π) β 1 I. cos 30° __________ 10. 1 β 2 sin2(2π) J. sin 40° __________ 11. cos2 40° β sin2 40° K. cos 80° __________ 12. β 1βcos 80° 2 L. sin 30° __________ 13. β 1+cos 70° 2 M. tan 50 __________ 14. 8 sin π cos π N. 4 sin 2π __________ 15. sin π cos π O. cos 6π __________ 16. 10 cos2 π β 5 P. 1 sin 2π 2 Q. sin 4π π π Write each expression as the sine, cosine, or tangent of a single angle. 1βcos 30° 1+cos 30° __________ 17. β __________ 18. 2 sin 15° cos 15° __________ 19. 2 cos2 45° β 1 __________ 20. cos2 ( 12 ) β sin2 ( 12 ) 7π 7π __________ 21. 8 β 16 sin2 10° __________ 22. π 8 π 1βtan2( ) 8 __________ 23. 12 sin 10° 1+cos 10° __________ 24. sin 2 cos 2 __________ 25. β 2 tan( ) π π 1βcos 100° 2 Double Angle and Half Angle KEY Matching. You may use the choices more than once or not at all. C __________ 1. 2 cos2 10° β 1 A. sin π H __________ 2. 2 sin 35° cos 35° B. cos 4π M __________ 3. 2 tan 25° 1βtan2 25° C. cos 20° G __________ 4. 4 tan 25° 1βtan2 25° D. cos 35° I __________ 5. 1 β 2 sin2 15° E. cos 8π A __________ 6. 2 sin cos π 2 F. 5 cos 2π E __________ 7. cos2 (4π) β sin2(4π) G. 2 tan 50° I __________ 8. 2 cos2 15° β 1 H. sin 70° O __________ 9. 2 cos2 (3π) β 1 I. cos 30° B __________ 10. 1 β 2 sin2(2π) J. sin 40° K __________ 11. cos2 40° β sin2 40° K. cos 80° J __________ 12. β 1βcos 80° 2 L. sin 30° D __________ 13. β 1+cos 70° 2 M. tan 50 N __________ 14. 8 sin π cos π = 4(2 sin π cos π) P __________ 15. F __________ 16. 2 2 tan 25° = 1 (1βtan2 25°) π 2 N. 4 sin 2π sin π cos π = 2 (2 sin π cos π) O. cos 6π 10 cos2 π β 5 = 5(2 cos 2 π β 1) P. 1 sin 2π 2 Q. sin 4π 1 Write each expression as the sine, cosine, or tangent of a single angle. 1βcos 30° 1+cos 30° πππ§ ππ° __________ 17. β π¬π’π§ ππ° __________ 18. 2 sin 15° cos 15° ππ¨π¬ ππ° __________ 19. ππ ππ¨π¬ __________ 20. π 2 cos2 45° β 1 7Ο 7Ο cos2 ( 12 ) β sin2 ( 12 ) πππ¨π¬ ππ° 21. __________ π πππ§ __________ 22. π πππ¬π’π§ π° 23. __________ π π¬π’π§ π __________ 24. π π¬π’π§ ππ° 25. __________ 8 β 16 sin2 10° = 8(1 β 2 sin2 10°) Ο 8 Ο 1βtan2( ) 8 2 tan( ) 12 sin 10° 1+cos 10° = Ο Ο 12 sin 10° ( ) 1 1+cos 10° 1 Ο Ο sin 2 cos 2 = 2 (2 sin 2 cos 2 ) β 1βcos 100° 2