Find the image of interval \( [-1,3] \) under the mapping specified by the function \( f(x)=4 x^...

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Find the image of interval \( [-1,3] \) under the mapping specified by the function \( f(x)=4 x^{3}-12 x \)
(a) \( [-2,0] \)
(b) \( [-8,72] \)
(c) \( [8,72] \)
(d) \( [1,3] \)
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