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Trig identities

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Trig identities

1. 1. cotx= (quotient identity)
3. 3. tan(x/2)= (half angle identity)
5. 5. tan(x+y)= (sum identity)
7. 7. sin(x+y)= (sum identity)
9. 9. cos(2x)= (double angle identity)
10. 10. =cos 2 x-sin 2 x (main-others are found using Pythagorean Identities) =2cos 2 x-1 =1-2sin 2 x Answer
11. 11. sin(x/2)= (half angle identity)
13. 13. sinx= (reciprocal identity)
15. 15. cot 2 x= (Pythagorean identity)
16. 16. =csc 2 x-1 Answer
17. 17. tanx= (reciprocal identity)
19. 19. cos(x+y)= (sum identity)
21. 21. sin(x-y)= (difference identity)
23. 23. sin 2 x= (Pythagorean identity)
24. 24. =1-cos 2 x Answer
25. 25. cos(x/2)= (half angle identity)
27. 27. tanx= (quotient identity)