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= [latex] \frac{3}{3} - \frac{2}{3} [/latex] =[latex] \frac{1}{3} [/latex]=0.3 √1-1/3=[latex] \frac{9}{9} - \frac{1}{9} = \frac{8}{9} = \frac{ \sqrt{8} }{3} [/latex]