Help with Calculus problem please ! ?

Question

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............ x
If f(x) = ò t dt, then f ''(x) =
............ 2

Answer 1

I assume that's suppose to be an integral symbol.

f(x) = [1/2 t²] from 2 to x, or 1/2 x² - 1

Then f'(x) = x, and f''(x) = 1.

Didn't really need to do the integration...