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  1. BloodyFrozen

    Finding The Limit Of A 3D Function

    EDIT: I'd go with SammyS's
  2. BloodyFrozen

    Can I become a physicist?

    I think it's a bit early to ask if you can become a physicist. If you like science, then pursue it. You don't come close enough to knowing enough physics/math to know whether or not you would like to major in it much less go to grad school. Just relax. Work on improving your grades and maybe...
  3. BloodyFrozen

    Algebra A book of Abstract Algebra by Pinter

    Great book. I think a (HS) student with a deep interest in mathematics would enjoy his informal, yet rigorous exposition to the material. If one already knows proofs, a more advanced book would probably be more appropriate.
  4. BloodyFrozen

    Calculus Calculus Series by Larson

    It's a decent exposure for HS calculus. In my opinion, it focuses to much on apply formulas. Then and again, that's high school calculus.
  5. BloodyFrozen

    Download the free PF App for iPhone/Android phones

    I rated the app for iPhone. I'm happy to say it has a much nicer layout. Just need the TeX.
  6. BloodyFrozen

    Geometry Geometry Revisited by Coxeter

    Good for high school math competitions. Almost all the topics are not covered in a standard high school math course.
  7. BloodyFrozen

    Am I ready for Real Analysis I?

    What is the description for vector analysis. I would guess PDEs are useful for appplied, but I'm not qualified to say it's true nor what you should take. I'd suggest for someone else's opinion. Ask your professors; they know the most.
  8. BloodyFrozen

    Am I ready for Real Analysis I?

    If you look at this webpage, you can see some of the Analysis problems. If they interest you, you might want to take it. https://web.math.princeton.edu/~adeptrep/lowerdiv/215/MAT215
  9. BloodyFrozen

    Am I ready for Real Analysis I?

    Baby Rudin - Principles of Mathematical Analysis Big Rudin are the actual 2 analysis ones
  10. BloodyFrozen

    Am I ready for Real Analysis I?

    It's great if you can keep up with the classes, but I would think Real Analysis already assumes a good grasp/knowledge with proofs. EDIT: Oh - it's baby Rudin. It's not that bad then. At Princeton, Baby Rudin is used as a honors math track. It's rigorous, but if you commit to it, you'll do...
  11. BloodyFrozen

    Natural log (ln x) derivative question

    Is that a ##f(y)##? Or like ##f(x) = y =~ ...##
  12. BloodyFrozen

    Very basic question about vector orientation

    (0,-2) http://www.math10.com/en/geometry/vectors-definitions/vectors.html
  13. BloodyFrozen

    Easy exponential question-> 1/3(8)^(-2/3)

    $$8^{\frac{-2}{3}} = \frac{1}{8^{\frac{2}{3}}}$$
  14. BloodyFrozen

    Basic integration - 1/sqrt(x)

    $$\frac{1}{\sqrt{x}} = x^{\frac{-1}{2}}$$
  15. BloodyFrozen

    Differentiate the following equation

    You're derivative is right. Are you sure they didn't ask you to evaluate the derivative at some point? I'm guessing that they want you to evaluate it at 0.
  16. BloodyFrozen

    Evaluate the Following Integral

    Sorry, my misinterpretation/ignorance.
  17. BloodyFrozen

    Evaluate the Following Integral

    That is part of the limit of integration. It doesn't tell us that y is a function of x. y in this case is just like x; it's a dummy variable. Just integrate first with respect to y, then evaluate the inner integral. At this point, the integrand should be in terms of x. Then just integrate...
  18. BloodyFrozen

    Evaluate the Following Integral

    Where does it say ##y = \frac{x}{2}##? I believe in your case, y is independent of x.
  19. BloodyFrozen

    Integrate cos(x)-cos(x-c) from 0 to c/2

    $$sin(\frac{c}{2})-sin(\frac{c}{2})cos(c)+cos(\frac{c}{2})sin(c)-sin(c)$$ $$sin(\frac{c}{2})-sin(c)+cos(\frac{c}{2})sin(c)-sin(\frac{c}{2})cos(c)$$ You have to realize (from trig addition identity) that ##cos(\frac{c}{2})sin(c)-sin(\frac{c}{2})cos(c) = sin(c-\frac{c}{2}) = sin(\frac{c}{2})##...
  20. BloodyFrozen

    How to find the derivative of this?

    You have the general idea, but your grouping is wrong. $$\frac{dy}{dx} ~=~ y\cdot [px^{p-1}ln(x)+\frac{x^{p}}{p}+\frac{p}{x}]$$
  21. BloodyFrozen

    How to find the derivative of this?

    You almost got it. How did you expand ##ln(p^{x^{p}})## After this, take the derivative. A little late edit.
  22. BloodyFrozen

    First Year Physics

    What is the difference between these two? They look almost exactly the same in the product description. https://www.amazon.com/dp/0070049084/?tag=pfamazon01-20 https://www.amazon.com/dp/1107013607/?tag=pfamazon01-20
  23. BloodyFrozen

    First Year Physics

    Alright, thanks.
  24. BloodyFrozen

    First Year Physics

    There's two AP Physics C tests. Mechanics and Electricity and Magnetism. I'm planning to take both. Is this the right book? https://www.amazon.com/gp/product/0471105589/?tag=pfamazon01-20 Is Halliday and Resnick good in your opinion?
  25. BloodyFrozen

    First Year Physics

    Ok. All of this will also prepare me for the AP exam?
  26. BloodyFrozen

    First Year Physics

    Also, is Grffiths any good for electricity and magnetism?
  27. BloodyFrozen

    First Year Physics

    I'm just talking about my school's physics program. It's all memorization. We're given a bunch of fornulas and told to memorize them. I'd just like to have an actual book(s) that give the reader how the result is derived. Regardless, I will be taking the AP Physics C exam, so I would like to be...
  28. BloodyFrozen

    First Year Physics

    I've always had problems with learning physics. It's not that I don't like it or can't do the calculations, but rather the memorization of thousands of equations that can easily derived. Of course, memorizing the important ones are necessary, so we don't have to constantly rederive them. So, my...
  29. BloodyFrozen

    Do you need calculus to learn pure mathematics?

    Pinter is very friendly and a good intro. It's easy, but well-written.
  30. BloodyFrozen

    Teaching myself calculus?

    He also used the one above. I remember reading about it and something having to do with his teachers.
  31. BloodyFrozen

    Teaching myself calculus?

    Yes, I remember reading it as an intro to calculus awhile back. It definitely helps you with the intuition on some of the ideas.
  32. BloodyFrozen

    Teaching myself calculus?

    Spivak would definitely be an overkill if he doesn't want the rigor. Plus he need's the maturity before attempting it.
  33. BloodyFrozen

    Do you need calculus to learn pure mathematics?

    It's good to have some (rigorous) calculus/LA because it is then where you start to get acquainted with "real math" (proofs).
  34. BloodyFrozen

    No of roots of a equation

    What do you mean? Are you trying to integrate it?
  35. BloodyFrozen

    Solving Modulus Equation: Find z=a+bi

    I fixed then end before, I just forgot to change the middle parts.
  36. BloodyFrozen

    Solving Modulus Equation: Find z=a+bi

    Right. Let me just go fix that. Edit. Fixed
  37. BloodyFrozen

    Solving Modulus Equation: Find z=a+bi

    Homework Statement Find all ##z=a+bi## such that: |z|=|z^{2}+1| Homework Equations The Attempt at a Solution I expanded the components. |z|=|z^{2}+1| z^{2}=a^2-b^2+2abi \sqrt{a^{2}+b^{2}}=\sqrt{(a^{2}-b^{2}+1)^{2}+(2ab)^{2}} a^2+b^2=(a^{2}-b^{2}+1)^{2}+(2ab)^{2}...
  38. BloodyFrozen

    Physicsforums Bibliography

    Author: Apostol Title: Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra Amazon Link: https://www.amazon.com/dp/0471000051/?tag=pfamazon01-20 Prerequisities: PreCalculus/Algebra & Trig ; Ideal with a basic knowledge of calculus however, it's fine without it...
  39. BloodyFrozen

    Physicsforums Bibliography: Discussion thread

    Author: Apostol Title: Calculus Volumes 1 & 2: with an Introduction to Linear Algebra Amazon Link: https://www.amazon.com/dp/0471000051/?tag=pfamazon01-20 Prerequisities: PreCalculus/Algebra & Trig ; Ideal with a basic knowledge of calculus however, it's fine without it. Contents: **Integration...
  40. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    Ah, that's what I thought. Thanks!
  41. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    For the second system, I don't get any solutions. Therefore, that can't be the right system.
  42. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    Sorry for not having LATEX since I'm on my phone, but I got: System 1: a+b=0 5+1+ab=5 5a+b=4 System 2: a+b=0 -5-1+ab=5 -5a-b=4
  43. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    I end up getting two systems but one of them has no solution. Did I proceed correctly?
  44. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    Ah, I believe I've seen this before. The method is nice, but it seems a little lengthy. Thanks for the link :smile:
  45. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    Oh, I see, but how do we know when the factors are "nice"?
  46. BloodyFrozen

    No of roots of a equation

    Pfft. :grumpy:
  47. BloodyFrozen

    Finding Quartic Roots Without Knowing One Factor

    Is there a method to finding the roots of quartics besides Ferrari's formula? I have the equation x^{4}+5x^{2}+4x+5=0 I know one of the factor is something like $$x^{2}+x+1$$ and the other one can be found using sythetic division, but how can I find the factors without knowing one of...
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