# Trigonometric Identities

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1. cotx = ?
1/tanx or cosx/sinx
2. secx = ?
1/cosx
3. cscx = ?
1/sinx
4. sinx = ?
1/cscx
5. cosx = ?
1/secx
6. tanx = ?
• 1/cotx
• sinx/cosx
7. cos2x + sin2x = ?
1
8. 1 + tan2x = ?
sec2x
9. cot2x + 1 = ?
csc2x
10. cos(A - B) = ?
cosAcosB + sinAsinB
11. cos(A + B) = ?
cosAcosB - sinAsinB
12. sin(A - B) = ?
sinAcosB - cosAsinB
13. sin(A + B) = ?
sinAcosB + cosAsinB
14. tan(A - B) = ?
(tanA - tanB)/(1 + tanAtanB)
15. tan(A + B) = ?
(tanA + tanB)/(1-tanAtanB)
16. sin2x = ?
2sinxcosx
17. cos2x = ?
• cos2x - sin2x
• 1 - 2sin2x
• 2cos2x - 1
18. tan2x = ?
(2tanx)/(1-tan2x)
19. 1 - sin2x = ?
cos2x
20. 1 - cos2x = ?
sin2x
21. sec2x - tan2x = ?
1
22. sec2x - 1 = ?
tan2x
23. csc2x - cot2x = ?
1
24. csc2x - 1 = ?
cot2x
25. tanxcotx = ?
1
26. cosxsecx = ?
1
27. sinxcscx = ?
1
28. sin2x/cos2x = ?
tan2x
29. cos2x/sin2x = ?
cot2x
30. 1/sec2x = ?
cos2x
31. 1/cot2x = ?
tan2x
32. 1/csc2x = ?
sin2x
 Author: Anonymous ID: 215565 Card Set: Trigonometric Identities Updated: 2013-04-24 19:26:28 Tags: Trig Identities AP Calc Folders: Description: Trig Identities Show Answers: