Объяснение:
x² - 1 = (-1)^n arcsin(√2/2) + πn, n ∈ Z
x² - 1 = (-1)^n (π/4) + πn, n ∈ Z
x² = (-1)^n (π/4) +1 + πn, n ∈ Z
x = ± [ (-1)^n (π/4) +1 + πn, n ∈ Z]
