- 1. Equazioni goniometriche elementari: $senx = 1/2$; $cosx = sqrt(2)/2$; $tgx=sqrt(3)$; $sinx= sqrt(2)/2$; $cosx=-1/2$; $tgx=-sqrt(3)/3$; $senx= sqrt(2) /3$ Antonio Bernardo
- 2. Equazioni goniometriche $cos2x=-sqrt(3)/2$; $sen x/2 = sqrt(3)/2$; $tg (x+15)/2=sqrt(3)$ Antonio Bernardo
- 3. Equazioni goniometriche particolari $sen(3x+ \pi /4)=senx$; $cos2x=cos(x+ \pi/6)$; $tg(3x+ \pi/7)=tg(4x- \pi/8)$ Antonio Bernardo
- 4. $sen^2 x- senx=0$ Antonio Bernardo
- 5. $6sen^2 x +19senx -11=0$ Antonio Bernardo
- 6. $sen^2 x = 1/2 sen(180-x)$ Antonio Bernardo
- 7. $3cos^2 x +2sen^2 x -tg^2 x = 3/2$ Antonio Bernardo
- 8. $4 sen(45+x)-2 sqrt(2) sen(90-x)=sqrt(2)$ Antonio Bernardo
- 9. $cos2x=3-5senx$ Antonio Bernardo
- 10. $(1+cosx) sen^2 x/2 = (1-cos x)/4$ Antonio Bernardo
- 11. $1+cosx=cotg x/2$ Antonio Bernardo
- 12. $cos4x+cos2x=cos3x$ Antonio Bernardo
- 13. $sqrt(3) senx-cosx=0$ Antonio Bernardo
- 14. $cosx+sqrt(3)senx=sqrt(3)$ Antonio Bernardo
- 15. $senx-sqrt(3)cosx=sqrt(3)$ Antonio Bernardo
- 16. $sen^2 x+2senx cosx -3 cos^2x =0$ Antonio Bernardo
- 17. 2sen^2 x+1=4senx cosx$ Antonio Bernardo
- 18. ${(4cos^2x+3cos^2y=4),(2cosx+5cosy=6):} Antonio Bernardo