Вычислить но не по таблице брадиса. cos10°*cos50°*cos70°

cos10*cos50*cos70 = cos10*cos50*cos(90-20) = cos10*cos50*sin20 =cos50*(sin(20-10)+sin(20+10))/2 = cos50*(sin10+sin30)/2 = (cos50*sin10+cos50*(1/2))/2 =((sin(10-50)+sin(10+50))/2+cos50*(1/2))/2 = (sin(-40)+sin60+cos50)/4 =(cos50-sin40+V3/2)/4 = (cos50-sin(90-50)+V3/2)/4 = (cos50-cos50+V3/2)/4 = V3/8