Sin x/2= - корень из 2/2
david777ge
sin (x/2) = - √2 /2
x/2 = (-1)ⁿ⁺¹ (π/4) +πn , n∈ ℤ ;
x = (-1)ⁿ⁺¹(π/2) + 2πn , n∈ ℤ.
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