SIN(x)·(2·SIN(x) + √2) = 2·SIN(x) + √2
SIN(x) = t
t·(2·t + √2) - (2·t + √2) = 0
√2·(t - 1)·(√2·t + 1) = 0
t = - √2/2 ∨ t = 1
SIN(x) = - √2/2: x = 5·pi/4 + 2·k·pi ∨ x = - pi/4 + 2·k·pi
SIN(x) = 1 : x = pi/2 + 2·k·pi
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