sin(x+y)= sinx cosy+siny cosx
cos(x+y)= cosx cosy-sinx siny
sin(x-y)= sinx cosy-siny cosx
cos(x-y)= cosx cosy+sinx siny
tg(x+y)=
tgx=
tg(x-y)=
ctgx=
ctg(x+y)=
tgx=
ctg(x-y)=
sin
x+cos
x=1
sin
=
cos
=
c a
tg
=
b ctg
=
a2+b2=c2