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# Trig identities

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### Transcript

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