Объяснение:
sin160°*cos110°+tg110°*tg340°=
=sin(180°-20°)*cos(90°+20°)+ tg(90°+20°)*tg(360°-20°)=
=sin20°*(-sin20°)+( -ctg20°)*(-tg20°)=
= -sin²20°+1= cos²20°
Объяснение:
sin160°*cos110°+tg110°*tg340°=
=sin(180°-20°)*cos(90°+20°)+ tg(90°+20°)*tg(360°-20°)=
=sin20°*(-sin20°)+( -ctg20°)*(-tg20°)=
= -sin²20°+1= cos²20°