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- Thread starter dwsmith
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- Thread starter
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- Feb 13, 2012

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The denominator vanishes if $\displaystyle y = x + n\ \pi$, n being an integer. The numerator vanishes if $\displaystyle y= x + 2\ k\ \pi$, k being and integer, and in these points f(*,*) is continous, not if $\displaystyle y = x + (2\ k +1)\ \pi$, k being an integer, and in these points f(*,*) is discontinous...Points of discontinuity

$f(x,y) = \begin{cases}\frac{\sin x - \sin y}{\tan x - \tan y}, & \text{if } \tan x\neq\tan y\\

\cos^3 x, & \text{if } \tan x = \tan y\end{cases}$

Not sure what to do with this one.

Kind regards

$\chi$ $\sigma$