Calc
posted by Rebekah .
find the second derivative
f(x)= 1/(4u^23)^2

f(u) = (4u^23)^2
f' = 2(4u^23)(8u)
= 16u(4u^23)^3
f" = 16(4u^23)^2 + 48u(8u)(4u^23)^4
= 16(20u^2+3)(4u^23)^4
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