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## Homework Statement

Let f (x) =int(x,0) x sin(t^2)dt. Show that f''(x)= 2 sin(x^2) + 2x2 cos(x^2)

## Homework Equations

## The Attempt at a Solution

I cant get f''(x)= 2 sin(x^2) + 2x2 cos(x^2), i can only get f''(x)= sin(x^2) + 2x2 cos(x^2).

Because f'(x)=xsin(x^2). can anyone see the problem?