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Study23

  • 2 years ago

Logarithmic Derivatives?

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  1. Study23
    • 2 years ago
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    \(\ \Large f(\theta)=ln(cos\theta) ??\)

  2. nubeer
    • 2 years ago
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    ln(x) its derivative is (1/x)d/dx(x)

  3. nubeer
    • 2 years ago
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    do the same with cosx

  4. Study23
    • 2 years ago
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    So use the Chain Rule?

  5. nubeer
    • 2 years ago
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    hmm not so let me draw for u.

  6. nubeer
    • 2 years ago
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    |dw:1353048499720:dw| when u have to take derivatives of log functions this is formula u have to remember

  7. Study23
    • 2 years ago
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    ?

  8. nubeer
    • 2 years ago
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    |dw:1353048585263:dw|

  9. Study23
    • 2 years ago
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    So: |dw:1353048624893:dw| Or do I insert ln(cosx)?

  10. malical
    • 2 years ago
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    So use the chain rule.

  11. nubeer
    • 2 years ago
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    no just cos x

  12. Study23
    • 2 years ago
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    @malical after this step?

  13. malical
    • 2 years ago
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    Yes. Nubeer said no but his drawing said yes. That d/dx is taking another derivative of just cosx.

  14. Study23
    • 2 years ago
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    Oh okay, that's what I was thinking! Thanks for the help guys!

  15. nubeer
    • 2 years ago
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    yeah my bad.. sorry.

  16. Study23
    • 2 years ago
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    That's okay @nubeer. I'm appreciate that you tried to help! ;)

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