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Sombra ShadowU.S.
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I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.  
Scott A WilsonU.S.
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I can answer any question in general math, arithetic, discret math, algebra, box problems, geometry, filling a tank with water, trigonometry, precalculus, linear algebra, complex mathematics, probability, statistics, and most of anything else that relates to math. I can also say that I broke 5 minutes for a mile, which is over 12 mph, but is that relevant?  
PeterSouth Africa
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I can answer all algebra and geometry questions from any grade. I am nearly finished my teaching degree and need experience. Anyone interested in talking to me is welcome!  
Janet YangU.S.
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I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.  
randy pattonU.S.
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college mathematics, applied math, advanced calculus, complex analysis, linear and abstract algebra, probability theory, signal processing, undergraduate physics, physical oceanography  
Ahmed SalamiNigeria
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I can provide good answers to questions dealing in almost all of mathematics especially from A`Level downwards. I can as well help a good deal in Physics with most emphasis directed towards mechanics.  
SocratesAvailable

I can answer any questions from the standard four semester Calulus sequence. Derivatives, partial derivatives, chain rule, single and multiple integrals, change of variable, sequences and series, vector integration (Green`s Theorem, Stokes, and Gauss) and applications. PreCalculus, Linear Algebra and Finite Math questions are also welcome.  
Clyde OliverU.S.
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I can answer all questions up to, and including, graduate level mathematics. I am more likely to prefer questions beyond the level of calculus. I can answer any questions, from basic elementary number theory like how to prove the first three digits of powers of 2 repeat (they do, with period 100, starting at 8), all the way to advanced mathematics like proving Egorov's theorem or finding phase transitions in random networks. 
Perhaps I didn't say it right, so I'll use the example you gave ... What I get from (4,8) r=5, (11,7) r=5, and (16,17) r=10 is ... For the x, I get (4*25 + 11*25 + 16*100)/(25+25+100) = (100 + 275
MIchael, Apparently, only the 1st page of my notes to you were attached in my latest answer. This is because All Experts requires only image formats to be attached (jpeg, png, etc) and the conversion
Here's some calculations reading the first integral you asked about. Hopefully it will help you understand more about the technique. I know the denominator was supposed to be squared, but I worked out
Thanks for the response. When you say the denominator should be squared do you mean the original function should be sin(2x)/[x^2+9]^2 ? I can try and work with that. I'd still like to see what your
David, I'm afraid I don't follow your approach. For doing a contour integral, I would have defined sin(2x)/(x^2+9) = Im{phi(z)} phi(z) = exp(i2x)/(z^2+9) where z is complex, and then defined
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