C.E. : R
y = SIN(x)^2 - SIN(x)
y' =0---> COS(x)·(2·SIN(x) - 1) = 0
COS(x) = 0----> x = pi/2 + k·pi
2·SIN(x) - 1 = 0---> SIN(x) = 1/2
x = 5·pi/6 + 2·k·pi ∨ x = pi/6 + 2·k·pi
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