Verified answer

Ответ: t = (pi - V(pi^2+16)) / 4

Объяснение: по условию

-pi/2 <= t <= pi/2

2t^2 - pi*t - 2 = 0

D=pi^2+16

t1 = (pi - V(pi^2+16)) / 4

t2 = (pi + V(pi^2+16)) / 4 > pi/2

t2 примерно= (3.14+5.1)/4 > 1.57