#Assume f has a continuous second derivative. No idea where to even start with this

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leaden path
placid ventureBOT
leaden path
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Only need help with question 2, no idea where to even start with this

gilded egret
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it would become xf''x - bf''x

dire patrol
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Consider the integral of f'(x) between a and b.
That integral is on one hand equal to f(b)-f(a).

On the other hand, integrate it by parts:
Set v = f'
u' = 1
And then take u = x-b
And therefore v' = f''

Therefore we have the integral of f' =
[(x-b) f'(x)] between a and b- integral ( f"(x)(x-b))

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$f(b)-f(a) = \int_a^b f'(x)
= [(x-b)f'(x)]_a^b - \int_a^b f"(x)(x-b)$

grand cairnBOT
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Daddy_314

leaden path