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Calculus 1 Worksheet #4 Limits involving trigonometric functions: lim sin( ) x 0 KNOW THE FOLLOWING THREE THEOREMS: A. lim sin x 0 1 B. lim x 0 sin 1 C. lim 1 cos x 0 0 Examples: sin 3x sin 3x 3 sin 3x lim lim 3 3 x 0 x 0 x 0 x x 3 3x 1 cos 7 x 1 cos 7 x 7 1 cos 7 x lim lim 7 0 2. lim x 0 x 0 x 0 x x 7 7 x sin 2 x tan 2 x sin 2 x sin 2 x 2 lim lim cos 2 x lim lim x 0 x 0 x 0 x 0 x x x cos 2 x x cos 2 x 2 3. 2 sin 2 x 2 2 lim lim lim 2 x 0 cos 2 x 2 x x 0 cos 2 x x 0 cos 2(0) 1. lim Problems: 1 sin x 2 1. lim x 0 x tan x 5. lim x 0 x 3sin x 9. lim x 0 x sin 2 x 13. lim x 0 x 1 cos( 2 x) 17. lim x 0 2x 2. lim x csc x sin 2 x sin x 3. lim x 0 x 0 sin 3 x x 0 sin 2 x sin 3 x 10. lim x 0 5x sin ax 14. lim x 0 sin bx x2 18. lim x 0 cos x 4. lim x 0 sin 3 x x 0 x sin 4 x 11. lim x 0 2x sin 4 2 x 15. lim x 0 4 x4 19. lim (tan x) 6. lim sin x x 0 2x 3x 12. lim x 0 sin x sin 5 x 16. lim x 0 5x 1 cos x 20. lim x 0 sin 2 x 7. lim x sin ax ,a 0 x 8. lim 4 Answers: 1 2 9) 3 1) 17) 0 2) 1 3) 2 4) a 5) 1 3 5 18) 2 11) 2 12) 3 13) 0 10) 19) 1 20) 6) 7) 3 3 2 14) a b 15) 4 1 2 16)1 8) 1 2 Revised: 6/22/2017