производная от 1/2 х²
если (1/2) * x^2
то ( 0.5*x^2 )' = 0.5*2x = x
если 1/ (2*x^2)
то ( 1/ (2*x^2) )' = ( 0.5*x^(-2) )' = -1*x^(-3) = -1/x^3
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если (1/2) * x^2
то ( 0.5*x^2 )' = 0.5*2x = x
если 1/ (2*x^2)
то ( 1/ (2*x^2) )' = ( 0.5*x^(-2) )' = -1*x^(-3) = -1/x^3