Homework Help: Math

Posted by Ifi on Sunday, October 28, 2012 at 10:07am.

Differentiate ln (1+ cos x)...
My ans is (-sin x)/ (1+cos x), but at wolfram is
-tan (x/2). I think they simplify it but how did they do it? Sorry for my little knowlegde....

Math - Steve, Sunday, October 28, 2012 at 12:03pm
look up your half-angle formulas. This is a standard form.

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