1) tg( 14π + π/4)·Sin(55π - π/6)·Cos(20 π + π/3)=
tg π/4· (-Sin π/6)·(-Cos π/3) = 1·(-1/2)· (-1/2) = 1|4
2) Cos²(180 - 20) Cos²(270 + 20)/Cos(180 +25)·Cos(270 - 25)=
= Cos²20 ·Sin²20/-Cos 25·(-Sin 25)= 1/4 Sin²40/ 1/2Sin 50= 1/2 · Sin²40/Сos 40=
=1/2 Sin 40·tg 40