Evaluate, underset(xto1)"lim"(x^(4)-1)/(...

Evaluate, `underset(xto1)"lim"(x^(4)-1)/(x-1)= underset(xtok)"lim"(x^(3)-k^(3))/(x^(2)-k^(2))` , then find the value of k.

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The correct Answer is:

`k=8/3`

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