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| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 11 months |
| seen | May 22 at 16:30 | |
| stats | profile views | 30 |
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May 22 |
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Choice of numbers in calculating $\lim_{x\rightarrow 0}\frac{e^{2x}-1}{\sin 3x}$ Ah, yes, I meant 2x, question is updated. |
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Jan 19 |
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Approaching infinity with volume of turning body The answer is $2\pi\left[ \ln \frac{t}{t+1} + \frac{1}{t+1} \right ]_1^\sqrt{w}$ |
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Jan 19 |
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Approaching infinity with volume of turning body That's my thinking, yes, but it doesn't seem to be it according to the text book answer. |
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Sep 16 |
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Finding correlation through plotting logarithms I added the values. |
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Sep 16 |
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Finding correlation through plotting logarithms I need to find a correlation between the values that result in the $x$ and $y$ axes. I can edit and add the values, but it's more about understanding how to solve this type of problem, than to solve this specific problem with those specific values. |
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Sep 14 |
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Found one root, how do I know to keep searching or not? Hm, yes, thanks. Still not sure how I managed to get it so wrong. Thanks! |
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Sep 13 |
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Finding $\alpha$ for $\sin(4 \alpha + \frac{\pi}{6}) = \sin (2\alpha + \frac{\pi}{5})$ I don't quite get your final line. When calculating $\frac{2\alpha + \frac{\pi}{30}}{2}$ I get $\alpha = n\pi + \frac{\pi}{60}$. Am I missing a step or something? |
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Sep 12 |
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Calculate $\cos(v+\frac{\pi}{6})$ when $\cos v = -\frac{2}{3}$ This helped a lot, I found the answer and it seems to be correct ($-\frac{2\sqrt{3}+\sqrt{5}}{6}$). Thank you! |
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Aug 30 |
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Calculating the chess problem, sum $\sum_{k=0}^{63}2^{k}$ Discovered my mistake - it was supposed to be $2^{64} - 1$, not $2^{64} + 1$. |
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Aug 25 |
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Finding all $x$ for $\frac{2x - 13}{2x + 3} \lt \frac{15}{x}$ It seems I figured everything out now. It was part of a bigger problem (uniting it with another inequality) and it seems like everything goes together perfectly now. Thanks a lot for the help. |
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Aug 25 |
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Finding all $x$ for $\frac{2x - 13}{2x + 3} \lt \frac{15}{x}$ Sorry, that was me being too excited after suddenly getting things right for once. Should have kept checking for roots after finding the obvious one. Thank you. |
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Aug 25 |
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Finding all $x$ for $\frac{2x - 13}{2x + 3} \lt \frac{15}{x}$ Thank you! Calculating for case (2) I find the root $-1$ for $2x^2 - 43x - 45$. Adding this to the roots of $2x(x+\frac{3}{2})$, this should mean that the entire expression is negative when $\frac{-3}{2} \lt x \lt -1$ or $0 \lt x$. However, when testing higher numbers (approximately where $x \gt 22$), $2x^2 - 43x - 45$ becomes positive and so the entire expression becomes positive. Why is this? |
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Aug 25 |
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Finding all $x$ for $\frac{2x - 13}{2x + 3} \lt \frac{15}{x}$ Thank you. Correction, though - the $45$ should be negative. |
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Aug 24 |
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How to find $k$'s quotient of $\frac{-18}{(-2)^k}$ Thank you, I see now. But don't you mean $\frac{a(r^{n+1}-1)}{r-1}$? Or am I mistaken? |
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Aug 24 |
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Getting wrong result calculating sums I can't believe I missed such a simple mistake. Thank you! |
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Aug 20 |
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Finding a value for $x$ when there should be none @AndréNicolas Ah, yes, I see. Thank you. |
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Aug 20 |
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Finding a value for $x$ when there should be none @AndréNicolas You mean dividing by $0$? |
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Aug 20 |
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Finding a value for $x$ when there should be none This is the second time in a row I've been stuck on a problem simply because I forgot about the zero-divide no-no. :/ Thanks. |
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Aug 18 |
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Calculating $x$ from $x^3 = 2x^2 - x$, getting wrong result Thanks! It never struck me that $x$ could be $0$ and that I discounted that possibility so easily. |
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Aug 18 |
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Calculating $x$ from $x^3 = 2x^2 - x$, getting wrong result I did actually try $x=1$ in the original equation, but were confused as I was supposed to find two separate for $x$. I didn't even stop to think it could be $0$. Thanks! |
