## Trigonometry Formulas

### Trigonometry formula Booklet PDF download

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Below formula list is a summery of only the basic formulas. The formula booklet PDF contains all the necessary formulas, diagrams and graphs.

 1. Sin2x+Cos2x = 1 2. 1+tan2x = Sec2x 3. 1+cot2x = Cosec2x 4. Sinx = $\frac{1}{\mathrm{cos}ecx}$ or cosecx = $\frac{1}{\mathrm{sin}x}$ 5. Cosx = $\frac{1}{secx}$ or secx = $\frac{1}{\mathrm{cos}x}$ 6. Tanx = $\frac{1}{cotx}$ or cotx= $\frac{1}{\mathrm{tan}x}$ 7. Sin2x = 2sinxcox 8. Cos2x = Cos2x-sin2x = 2cos2x-1 = 1-2sin2x 9. Tan2x = $\frac{2\mathrm{tan}x}{1–{\mathrm{tan}}^{2}x}$ 10. Sin3x = 3sinx-4sin3x 11. Cos3x = 4cos2x-3cosx 12. Tan 3x = 13. Sin(x+y) = Sinx cosy+ cosx siny 14. Sin (x-y) = Sinx cosy- cosx siny 15. Cos(x+y) = cosx cosy- sinx siny 16. Cos(x-y) = cosx cosy+ sinx siny 17. Tan(x+y) = $\frac{\mathrm{tan}x+\mathrm{tan}y}{1–\mathrm{tan}x\mathrm{tan}y}$ 18. Tan (x-y) = $\frac{\mathrm{tan}x–\mathrm{tan}y}{1+\mathrm{tan}x\mathrm{tan}y}$ 19. Cot (x+y) = 20. Cot (x-y) = 21. Sinx+ siny = 2sin 22. Sinx –siny = 2cos 23. Cosx+cosy = 2cos 24. Cosx-cosy = -2sin 25. 2 sinx cosy = Sin (x+y) +sin (x-y) 26. 2 cosx siny = Sin (x+y) –sin (x-y) 27. 2 cos x cosy = Cos (x+y) + cos (x-y) 28. 2 sinx siny = Cos (x-y) –cos (x+y)

### Rahul Aggrawal

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### This Post Has One Comment

1. Prashant Kumar Sinha

kindly fill the formula list properly..