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Jun
3
asked What are the dimensions of the region that minimizes the quantity of fence?
Jun
1
comment Verifying if these basis are positive or negative?
@Bernard I don't get it. I found one of them being positive and other being negative. How are thet both positive? I am aware that re-arranging the order of the vectors in the determinant changes the signal. Is that it?
Jun
1
asked Verifying if these basis are positive or negative?
Jun
1
comment What is wrong with my solution to this problem?
I guess this changes everything I tried to do. Later, I'll try to use my methods again and see if it works with this new ratio.
Jun
1
comment What is wrong with my solution to this problem?
(Oh, your answer is the same given by my book. I'm not saying it's wrong, I'm just asking for clarification).
Jun
1
comment What is wrong with my solution to this problem?
One doubt. Why $BM=1/3BA$? Isn't the point $M$ in the middle of $BA$?
May
30
accepted What is wrong with my solution to this problem?
May
29
comment What is wrong with my solution to this problem?
@AlexeyBurdin That is also acceptable. As my approach seems to not work. I just posted it here to show that I tried to do something.
May
29
comment What is wrong with my solution to this problem?
@AlexeyBurdin I tried it. I guess I was really confusing and interpreting the angle as it's tangent. I corrected it now, but I still don't know what is wrong. This time, the result of the determinant was $9$.
May
28
comment What is wrong with my solution to this problem?
@AlexeyBurdin Perhaps yes, I'll try to so it with the tangent of the angle.
May
28
comment $ABCD$ has area $9$. $M$ is in the middle of $AB$ and the edge $BF$ of length $2$ forms an angle of $60º$, Calculate $[CM,CB,BF]$.
@RoryDaulton Let's think about $CG$ as $BF$. I assumed that it forms an angle of $60$ on $C$. It's a parallelepiped.
May
28
asked $ABCD$ has area $9$. $M$ is in the middle of $AB$ and the edge $BF$ of length $2$ forms an angle of $60º$, Calculate $[CM,CB,BF]$.
May
27
asked What is wrong with my solution to this problem?
May
25
reviewed Approve Find eigenfunctions of the integral operator with kernel $\sum\limits_{n=1}^\infty \frac{1}{n^2} \sin((n+1)x)\sin(ny)$
May
25
reviewed Approve How to express $[u,v,w]$ as a function of $\phi,\theta$ and the norms of the vectors?
May
25
accepted Why having $ma+np=1$ implies that $m$ is the inverse?
May
25
asked How to express $[u,v,w]$ as a function of $\phi,\theta$ and the norms of the vectors?
May
23
revised The angle between $u$ and $v$ is $30º$, and the vector $w$ of norm $4$ is ortogonal to both $u,v$. Calculate $[u,v,w]$.
added 17 characters in body
May
23
accepted The angle between $u$ and $v$ is $30º$, and the vector $w$ of norm $4$ is ortogonal to both $u,v$. Calculate $[u,v,w]$.
May
23
asked The angle between $u$ and $v$ is $30º$, and the vector $w$ of norm $4$ is ortogonal to both $u,v$. Calculate $[u,v,w]$.