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 Dec 26 comment Limit of $\sin(x)$ as $x$ approaches zero from the left @angryavian I am trying to prove the continuity. See my update. Dec 26 revised Limit of $\sin(x)$ as $x$ approaches zero from the left title edited and tags added Dec 26 asked Limit of $\sin(x)$ as $x$ approaches zero from the left Nov 13 asked Cross product with basis vectors different from i, j, and k Nov 9 awarded Inquisitive Nov 5 awarded Popular Question Nov 5 awarded Notable Question Oct 15 revised Multivariable Chain Rule for partially differentiable maps added 6 characters in body Oct 15 revised Multivariable Chain Rule for partially differentiable maps added 51 characters in body Oct 15 comment Multivariable Chain Rule for partially differentiable maps @user251257 I have a reply to this answer posted as another answer. Love to hear if I am doing it correctly. Oct 15 revised Multivariable Chain Rule for partially differentiable maps added 73 characters in body Oct 15 answered Multivariable Chain Rule for partially differentiable maps Sep 19 awarded Popular Question Aug 23 awarded Notable Question Aug 10 asked Can Lagrange Multiplier method provide a saddle point in two dimensions Aug 6 asked Probability density function of Y=e^X given X is Poisson Aug 3 asked Critical point but not an extremum or saddle point Aug 2 comment Critical value example where partial derivative does not exist @RecklessReckoner Nice job. Thanks for the help. It will be very useful teaching class. Aug 1 comment Critical value example where partial derivative does not exist @RecklessReckoner How about an example where you get two critical values, one where both partial derivatives equal zero and one where at least one of the partial derivatives is undefined? Aug 1 asked Critical value example where partial derivative does not exist