Объяснение:
1) =2sin(36°+24°)/2 *cos(36°-24°)/2= 2sin30°*cos6°
2) =2sin(72°-52°)/2*cos(72°+52°)/2= 2sin10°*cos62°
3) = 2cos(16°+66°)/2*cos(66°-16°)/2= 2cos41°*cos25°
Объяснение:
1) =2sin(36°+24°)/2 *cos(36°-24°)/2= 2sin30°*cos6°
2) =2sin(72°-52°)/2*cos(72°+52°)/2= 2sin10°*cos62°
3) = 2cos(16°+66°)/2*cos(66°-16°)/2= 2cos41°*cos25°