Suppose for every integer \( n, . \int_{n}^{n+1} f(x) d x=n^{2} \) ...

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Suppose for every integer \( n, . \int_{n}^{n+1} f(x) d x=n^{2} \) The value of \( \int_{-2}^{4} f(x) d x \) is :
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(A) 16
(B) 14
(C) 19
(D) 21
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