Формулы сложения


  1. sin(x+y) =sin x*cos y+cos x*sin y
  2. sin(x-y) =sin x*cos y-cos x*sin y
  3. cos(y+x) = cos x*cos y+sin x*sin y
  4. cos(y-x) = cos x*cos y-sin x*sin y
  5. tg(x+y)=(tg x+tg y)/(1-tg x*tg y)       x,y,x+y≠π/2+πn
  6. tg(x+y)=(tg x-tg y)/(1+tg x*tg y)       x,y,x-y≠π/2+πn