anonymous
  • anonymous
f(x)=(1+16x^2)tan^-1(4x)...find the derivative...i got 128x/(1+16x^2)...its wrong...i keep missing a step
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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vijay
  • vijay
\[32x \tan^{-1} (4x) + 4\]
anonymous
  • anonymous
how did u get that
vijay
  • vijay
differentiation by parts

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anonymous
  • anonymous
but the derivative of tan^-1 is 1/1+x^2 and you plug 4x into for the x....anc then continue...what happened to that equation
vijay
  • vijay
tan^-1(x) = 1/ 1 +x^2, but tan^-1(4x) = 4/(4^2 + x^2)
anonymous
  • anonymous
ok so how did u get from that to the answer u gave
anonymous
  • anonymous
i dont understand why you would use the derivative equation for one problem and not the other

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