(1-1/k^2)*100

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Solution for (1-1/k^2)*100 equation: 


D( k )

k^2 = 0

k^2 = 0

k^2 = 0

1*k^2 = 0 // : 1

k^2 = 0

k = 0

k in (-oo:0) U (0:+oo)

100*(1-(1/(k^2))) = 0

100*(1-k^-2) = 0

-1*k^-2 = -1 // : -1

k^-2 = 1

-2 < 0

1/(k^2) = 1 // * k^2

1 = 1*k^2 // : 1

1 = k^2

k^2 = 1 // ^ 1/2

abs(k) = 1

k = 1 or k = -1

k in { 1, -1 }

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