1)cos(29°) × sin(59°) – sin(31°) × sin(29°) 2)cosa=2/3;3П sinb=1/3;П/2
1)cos(29°) × sin(59°) = 0,7496954135 sin(31°) × sin(29°) = 0,2496954135 0,7496954135 – 0,2496954135 = 0,5 √1-2/3= ==0.3 √1-1/3=