Sin (30° + a) - cos(60° + a) = /3 tg as
sin (30° + a) + cos(60° + a)
2 sin a cos ß - sin(a - )
= tg(a + b).
cos(a - b) – 2 sin a · sin ß
6)​

ИльяХлус    2   04.02.2021 11:30    8