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Sep
26
answered A little confusion with $\int_{1}^{∞}\frac1x$ dx = $\ln|x|$
Sep
24
accepted Dot product of two vectors with respect to their sum and difference.
Sep
24
comment Dot product of two vectors with respect to their sum and difference.
Does this sound right?
Sep
24
comment Dot product of two vectors with respect to their sum and difference.
I think I see what to do... $(a + b) \cdot (a + b) = M^2$. So similarly for $(a - b) \cdot (a - b)$ and you get $N^2$. Then consider expanding both terms (like I do above with $(a + b) \cdot (a + b)$ and then solving the system of equations I get: $$\frac{(a+b) \cdot (a+b) - (a - b) \cdot (a - b)}{4}$$ $$\frac{M^2 - N^2}{4}$$
Sep
24
revised Dot product of two vectors with respect to their sum and difference.
edited title
Sep
24
asked Dot product of two vectors with respect to their sum and difference.
Sep
11
revised When to use which derivative expanded function?
Fixed formulas.
Sep
11
suggested approved edit on When to use which derivative expanded function?
Aug
21
comment Intuition behind $(-\frac{1}{2})! = \sqrt{\pi}$
I'm definitely not sure, but this seems strongly related to this question: math.stackexchange.com/questions/3444/…
Aug
21
comment Intuition behind $(-\frac{1}{2})! = \sqrt{\pi}$
@YellowSkies: wikiwand.com/en/Gamma_function
Aug
21
revised Area of $A'B'C'$ is to area of $ABC$ is $\frac{(m-n)^2}{m^2+mn+n^2}$
Fixed title latex.
Aug
21
suggested approved edit on Area of $A'B'C'$ is to area of $ABC$ is $\frac{(m-n)^2}{m^2+mn+n^2}$
Jun
18
awarded  Fanatic
Jun
2
revised Polynomial in several variables over $GF(2)$
Improved legibility.
Jun
2
suggested approved edit on Polynomial in several variables over $GF(2)$
Jun
2
revised If I invert the argument, should I invert the constants in the equation?
Made it easier to read.
Jun
2
suggested approved edit on If I invert the argument, should I invert the constants in the equation?
May
27
comment Solve this equation: $(x+2)(\sqrt{2x+3}-2\sqrt{x+1})+\sqrt{2x^2+5x+3}=1$
$-1$ seems to work...
May
14
suggested rejected edit on complex nos in ellipse.
May
12
comment Quadratic solutions puzzle
(-1/2, -1/2) is a solution, but it is also said in the constraints that $a \neq b$.