Derivative,Logarithm,Cosine,Curve.
[1]:オーム社編:『機械工学公式集』,オーム社,pp.20,1960.
・LaTeX: \frac{d}{dx}\left ( \log_{e}\left | \cos x \right | \right )=-\tan x ・Making above Equation Image is powered by CODECOGS
・2010/02/26:Upload.