dharmatech
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# 11 Comments

 Mar 17 comment Simplifying And of equality expressions Thanks @BobHanlon! Aug 3 comment Find dy/dx given an equation Thank you Jens. Apr 7 comment Reduce on equations involving integrals Thanks belisarius. My questions is more to do with using Reduce on the expressions involving integrals however, not so much solving the problem. (I do like your solution though). Aug 6 comment Find the dimensions of a cylindrical can that will minimize the cost of the material Aha... I had been using D (partial derivative) necessitating the expression of h in terms of r. I see that Dt takes care of this. Thanks again J.M.! Aug 6 comment Find the dimensions of a cylindrical can that will minimize the cost of the material @J.M. I'm still curious as to how to solve it with Reduce. I added an answer which takes the approach I was looking for, but uses a rewrite kludge. Aug 6 comment Find the dimensions of a cylindrical can that will minimize the cost of the material @J.M. Wasn't familiar with Minimize... Thanks for the suggestion! However, is there a way to get the answer not in terms of Root? Feb 18 comment Using implicit differentiation to find a line that is tangent to a curve at a point Thank you @J.M.. I also decided to explore using a program to solve this sort of problem. I've posted a separate answer illustrating this approach. Feb 17 comment Using FindFit to fit $a\,b^t$: how to avoid introducing complex numbers? Excellent info and answer @David! Accepted! Feb 17 comment Using FindFit to fit $a\,b^t$: how to avoid introducing complex numbers? Hi David, thanks for the help! When I plot the curve: Plot[a*b^t /. {a -> 100.01244, b -> 0.000045146}, {t, 0, 0.1}] using the non-negative exponent with the values of a and b given, it appears to match the data pretty well. :-) Feb 16 comment Equation of a line that is tangent to a curve at point Thanks again J.M. Great answer. And thanks for moderating this new stackexchange site. Feb 16 comment Equation of a line that is tangent to a curve at point Thanks J.M.! The code I posted follows the approach taught in calculus texts. I wouldn't mind seeing an improved version of that approach as well (from anyone here).