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Logarithmic Derivatives?

Mathematics
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\(\ \Large f(\theta)=ln(cos\theta) ??\)
ln(x) its derivative is (1/x)d/dx(x)
do the same with cosx

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Other answers:

So use the Chain Rule?
hmm not so let me draw for u.
|dw:1353048499720:dw| when u have to take derivatives of log functions this is formula u have to remember
?
|dw:1353048585263:dw|
So: |dw:1353048624893:dw| Or do I insert ln(cosx)?
So use the chain rule.
no just cos x
@malical after this step?
Yes. Nubeer said no but his drawing said yes. That d/dx is taking another derivative of just cosx.
Oh okay, that's what I was thinking! Thanks for the help guys!
yeah my bad.. sorry.
That's okay @nubeer. I'm appreciate that you tried to help! ;)

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