(a) $f(x) = \begin{cases} 4\sqrt{x}, & 0 \le x \le 1\\ 6x - 2, & x > 1. \end{cases}$ (b) $f(x) = \begin{cases} -2x^2 + 4, & 0 \le x \le 1\\ 2x, & x > 1. \end{cases}$
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