Formules trigonométriques

sin(x+y)=sin(x)cos(y) + sin(y)cos(x)
cos(x+y)=cos(x)cos(y) - sin(x)sin(y)

sin(x-y)=sin(x)cos(y)-sin(y)cos(x)
cos(x-y)=cos(x)cos(y) + sin(x)sin(y)

sin(2x)=2sin(x)cos(x)
cos(2x)=cos²(x)-sin²(x)

cos²(x)+sin²(x)=1

(cos(x))'=-sin(x)
(sin(x))'=cos(x)
(tgt(x))'=1/cos²(x)