Trigonometry formulas šŸ“š

  1. Sin x = opposite side Ć· hypotenuse 
  2. Cos x = Adjacent side Ć· hypotenuse 
  3. Tan x = opposite side Ć· adjacent side
  4. Cot x = Adjacent side Ć· opposite side 
  5. Sec x = hypotenuse Ć· opposite side 
  6. Cosec x= hypotenus Ć· adjacent side 
  7. Sin x Ɨ Cosec x = 1
  8. Sin x = 1 Ć· cosec x
  9. Cosec x = 1 Ć· sin x
  10. Cos x Ɨ sec x = 1
  11. Cos x = 1 Ć· sec x
  12. Sec x = 1 Ć· cos x
  13. SinĀ² x + cosĀ² x = 1
  14. Cos x + tan x = 1
  15. 1 + cot x = cosecĀ²x 
  16. Sin(A +B) = sinA.cosB + cosA.sinB
  17. Sin(A-B) = sinA.cosB - cosA.sinB
  18. Cos(A+B) = cosA.cosB - sinA.sinB
  19. Cos(A-B) = cosA.cosB + sinA.sinB
  20. Tan(A+B) = tanA + tanB Ć· 1- tanA.tanB
  21. Tan(A-B) = tanA - tanB Ć· 1+ tanA.tanB
  22. Sin2x = 2sinx.cosx
  23. Sin2x = 2tanx Ć· 1+ tanĀ²x
  24. Cos2x = cosĀ²x - sinĀ²x
  25. Cos2x = 1 - 2sinĀ²x
  26. Cos2x = 2cosĀ²x - 1
  27. Tan2x = 2tanx Ć· 1- tanĀ²x
  28. Sin3x = 3sinx - 4sinĀ³x
  29. Cos3x = 4cosĀ³x - 3cosx
  30. Tan3x = 3tanx - tanĀ³x Ć· 1- 3tanĀ²x
  31. 1 + cos2x = 2cosĀ²x
  32. 1 - cos2x = 2sinĀ²x
  33. SinC + sinD = 2sin(C+D Ć· 2). Cos( C - D Ć· 2)
  34. SinC - sinD = 2cos(C+D Ć· 2). Sin( C - D Ć· 2)
  35. CosC + cosD = 2cos(C+D Ć· 2). Cos( C - D Ć· 2)
  36. CosC - cosD = -2sin(C+D Ć· 2).sin( C - D Ć· 2)
  37. 2sinA.cosB = sin(A+B) + sin(A-B)
  38. 2cosA.sinB = sin(A+B) - sin(A-B)
  39. 2cosA.cosB = cos(A+B) + cos(A-B)
  40. 2sinA.sinB = cos(A-B) - cos(A+B)




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