(4k)/(k^2-1)^2

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Solution for (4k)/(k^2-1)^2 equation: 


D( k )

(k^2-1)^2 = 0

(k^2-1)^2 = 0

(k^2-1)^2 = 0

1*k^2 = 1 // : 1

k^2 = 1

k^2 = 1 // ^ 1/2

abs(k) = 1

k = 1 or k = -1

k in (-oo:-1) U (-1:1) U (1:+oo)

(4*k)/((k^2-1)^2) = 0

4*k = 0 // : 4

k = 0

k = 0

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