Given the following function, with k as a constant, find the values of k for which f(x) = x^3 + kx^2 + 5x is one-to-one. a) -sqrt(15)/15 <= k <= sqrt(15)/15 b) k <= sqrt(15)/15 c) k >= -sqrt(15) d) -sqrt(15) <= k <= sqrt(15) e) k >= sqrt(15)
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