Verified answer

(tg(a) + 1)*(tg(b) + 1)  = 2

просто перемножим и преобразуем

tg(a)*tg(b) + tg(a) + tg(b) + 1 = 2

tg(a) + tg(b) = 2 - 1 - tg(a)*tg(b)

tg(a) + tg(b) = 1 - tg(a)*tg(b)  

(tg(a) + tg(b))/(1 - tg(a)*tg(b))=1

tg(a + b) = (tg(a) + tg(b))/(1 - tg(a)*tg(b)) табличная формула tg суммы

tg(a + b) = 1    

a, b ∈ (0,π/2)

a + b = π/4

3.2*((a + b)/π)² = 3.2*(1/4)² = 3.2 : 16 = 0.2

ответ В