# Tagged Questions

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I got the formula and I need to create the lineral-equation system matrix using it and then solve it. I decided to use wolfram mathematica to do this. I wrote the code. And when N and M are $> ... 1answer 43 views ### Discrepancy over matrix exponential I am trying to compute$\large e^A$for$A = \left( \begin{array}{ccc} 0 & a \\ 0 & 0 \end{array} \right)$Using$\large e^A = \sum \limits_{k=0}^\infty \frac{1}{k!} A^k$Writing out the ... 1answer 61 views ### Inputting complicated equation into Wolfram I am having a bear of a time getting this equation into Wolfram so I can solve it for E(r) = 1000. Everything is constant except for little r, which is the cursive r in each term. In case anyone ... 2answers 127 views ### What is this question asking me? Help appreciated! I was wondering if anyone would be able to help me understand what this question is asking me. How would I go about working these out on Wolfram Alpha? I'm not too sure how to input them. Any help is ... 1answer 128 views ### What's wrong with Wolfram Alpha (or me)? Integral involving exp(-t) The integral in question$\int e^{-t}\cdot (1+e^{-t})^{-2}dt$can be solved with an easy$u$-substitution. I'm getting$(1+e^{-t})^{-1}$which I can verify is correct by derivation. I'm rusty though ... 5answers 798 views ### Find the second derivative of$e^{x^{3}}+7x\$

$$e^{x^{3}}+7x$$ Here is what I have tried so far, $$y'=(e^{x^{3}})'+(7x)'$$ $$y'=3e^{x^{2}}e^x+7$$ $$y'=3e^{x^{3}+x}+7$$ I am supposed to find the second derivative but I believe I have already made ...
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### WolframAlpha blows simple substitution?

I am to find a formula for the n-th derivative of $$\frac{1+x}{1-x}$$ I came up with $$\frac{(-1)^{n+1} \times 2 \times n!}{(1-x)^{n+1}}$$ This seems right, but I noticed that WolframAlpha somehow ...