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Logarithmic Derivatives?



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Study23
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\(\ \Large f(\theta)=ln(cos\theta) ??\)

nubeer
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ln(x) its derivative is
(1/x)d/dx(x)

nubeer
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do the same with cosx

Study23
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So use the Chain Rule?

nubeer
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hmm not so let me draw for u.

nubeer
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dw:1353048499720:dw
when u have to take derivatives of log functions this is formula u have to remember

Study23
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?

nubeer
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dw:1353048585263:dw

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So: dw:1353048624893:dw Or do I insert ln(cosx)?

malical
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So use the chain rule.

nubeer
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no just cos x

Study23
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@malical after this step?

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

Study23
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Oh okay, that's what I was thinking! Thanks for the help guys!

nubeer
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yeah my bad.. sorry.

Study23
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That's okay @nubeer. I'm appreciate that you tried to help! ;)