(-1*х)^2 = (-1)^2*x^2 = x^2
(-x)^(2n+1) = (-1)^(2n+1)*x^(2n+1) = -x^(2n+1)
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(-1*х)^2 = (-1)^2*x^2 = x^2
(-x)^(2n+1) = (-1)^(2n+1)*x^(2n+1) = -x^(2n+1)