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  • 02-12-2017
  • Mathematics
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Find a formula for the function f(x) such that f′(x)=(ln(x))^2/x and f(2)=6

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chudung1976
chudung1976 chudung1976
  • 02-12-2017
f(x)= ∫ln²x/x dx= ∫ln²xd(lnx) cause d(lnx)= (lnx)'dx=1/x dx
= ln³x/3 +C with C is constant
In addition, we have f(2)=6, so we have 6=ln³2/3+C
or C= 6- ln³2/3
And f(x)= ln³x/3+  6- ln³2/3
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