Trigonometrie

Formule trigonometrice: 

      Sin = cateta opusa / ipotenuza
  1. Sin(-x)= - sinx
  2. Cos(-x)= cosx
  3. Tg(-x)= - tgx
  4. Ctg(-x)= - ctgx
  5. Sin(2π+x)=sinx
  6. Cos(2π+x)=cosx
  7. Tg(π+x)=tgx
  8. Ctg(π+x)=ctgx
  9. Sin(π±x)= - + sinx
  10. Cos(3π/2±x)= ±sinx
  11. Tg(π/2+x)= - ctgx
  12. Ctg(-π/2+x)= - tgx
  13. Ctg(3π-x)= - ctgx
  14. Tg(5π/2+x)= - ctgx
  15. Sec x=1/cosx
  16. Sin(x+y)=sinxcosy + sinycosx
  17. Cos(x+y)=cosxcosy - sinxsiny
  18. Tg(x+y)=(tgx + tgy)/(1 – tgx* tgy)
  19. Sinx+siny=2sin[(x+y)/2] *cos[(x-y)/2] -suma in produs
  20. Cosx+cosy=2cos[(x-y)/2]*cos[(x+y)/2] -suma in produs
  21. Cosx-cosy=2sin[(x-y)/2]*sin[(x+y)/2] -suma in produs
  22. Sin(2x)=2sinxcosx -omogenizarea (1/2x)
  23. Cos(2x)=cos2x-sin2x -omogenizarea (1/2x)
  24. 2sinxcosy=sin(x-y)+sin(x+y) -produs in suma
  25. 2cosxcosy=cos(x-y)+cos(x+y) -produs in suma
  26. 2sinxsiny=cos(x-y)-cos(x+y) -produs in suma
  27. Tg(2x)=2tgx/(1-tg2x) 
  28. 1+cos(2x)=2cos2x 
  29. 1-cos(2x)=2sin2x 
  30. 1+tg2x=1/cos2x 
  31. 1+ctg2x=1/ sin2x
Radiani Grade    Sin       Cos      Tg       Ctg               360 g = 2 π rad
    0            0          0          1          0          NA              1 rad = 57,32 g 
  π/6          30        1/2     √3/2      1/√3       √3
  π/4          45       √2/2    √2/2        1           1                Grade in radiani: g*π/180
  π/3          60       √3/2      1/2       √3       1/√3              Radiani in grade: 180*rad/π 
  π/2          90          1          0         NA         0
    π           180        0        -1           0         NA              Ecuatii:
3π/2          270       -1         0         NA         0                           
   2π          360         0         1          0          NA             sinx = a, |a|<1, nu are solutii
                                                                                      |a|1, x = (-1)n arcsin a+nπ
                                                                                      cosx = a, |a|<1, nu are solutii
                                                                                      |a|1, x = ±arccos a+2kπ
                                                                                      tgx = a, x = arctg a+nπ
                                                                                      ctgx = a, x = arccgt a+nπ 

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