= 1
Пошаговое объяснение:
1. sin 41°×cos41°= (1/2)×2×sin41°×cis41°=(1/2)×sin(2×41°)=(1/2)×sin82°
2. cos76°=cos(90°-14°)=sin14°
3. sin68°×cos14°+sin14°×cos68°=sin(68°+14°=sin82°
4. sin82°/sin82°=1
= 1
Пошаговое объяснение:
1. sin 41°×cos41°= (1/2)×2×sin41°×cis41°=(1/2)×sin(2×41°)=(1/2)×sin82°
2. cos76°=cos(90°-14°)=sin14°
3. sin68°×cos14°+sin14°×cos68°=sin(68°+14°=sin82°
4. sin82°/sin82°=1