1,510 reputation
1520
bio website
location
age
visits member for 2 years
seen 2 days ago

Jul
17
comment Is this a bug in FunctionDomain (V.10)?
Mclure First, thanks to your answer. I think, we want to find the domain of the given function, we must solve the inequality x^3+1<>0.
Jun
24
comment How do I calculate the area of a polygon given its coordinates?
Thank you very much.
Jun
24
comment How do I calculate the area of a polygon given its coordinates?
when I tried pts = {{5, 2}, {4, 1}, {1, 3}}; Graphics`Mesh`MeshInit[]; PolygonArea[pts] I got -2.5. I don't understand.
Jun
24
comment How do I obtain the enclosed area of this particular parametric plot?
I tried pts = {{5, 2}, {4, 1}, {1, 3}}; GraphicsMesh`MeshInit[]; PolygonArea[pts]` but I received -2.5
Jun
23
comment How can I get the exact real solution of this equation?
Let us continue this discussion in chat.
Jun
23
comment How can I get the exact real solution of this equation?
I am a teacher. When I teach for my students, in this case, when we solve by hand, we always conclude the given solution has only real solution (solve in real domain). Am I wrong?
Jun
23
comment How can I get the exact real solution of this equation?
Thank you very much for your answers and your helps.
Jun
23
comment How can I get the exact real solution of this equation?
Perhaps about my English, therefore my question is not clearly. My question is "How many solutions when I solve the equation Sqrt[x] + Sqrt[1 - x^2] == Sqrt[2 - 3 x - 4 x^2] in the real domain?
Jun
23
comment How can I get the exact real solution of this equation?
I have just online. Thank you four your answer.
Jun
23
comment How can I get the exact real solution of this equation?
I used Solve[Sqrt[x] + Sqrt[1 - x^2] == Sqrt[2 - 3 x - 4 x^2], x, Reals] // ToRadicals, then I got one real solution.
Jun
23
comment How can I get the exact real solution of this equation?
@MichaelE2 I use Solve[Sqrt[x] + Sqrt[1 - x^2] == Sqrt[2 - 3 x - 4 x^2], x, Reals] // ToRadicals and received one real solution. Thank you.
Jun
23
comment How can I get the exact real solution of this equation?
@Artes With Maple, I received one real solution. For me, the given equation has only one real solution.
Jun
23
comment How can I get the exact real solution of this equation?
@belisarius and @Algohi, with -1 - Sqrt[2], the Sqrt[-1 - Sqrt[2]]is not identified.
Mar
6
comment How to find the complex number has least and greatest modul satisfying a given condition?
No. But I think, the solution does not exactly.
Feb
24
comment How do I replace a variable in a polynomial?
see mathematica.stackexchange.com/questions/42121/…
Feb
17
comment How to avoid CopyTensor in CompiledFunctions?
@ Dao Trinh. Năm sau kỉ niệm 20 năm thành lập trường. Một số cựu học sinh thành lập học bổng mang tên Lương Thế Vinh. Bạn vào trang wew của trường để biết thêm thông tin. Sẽ có lời ngỏ của thầy Trần Anh Dũng, Hiệu trưởng nhà trường.
Feb
16
comment How to avoid CopyTensor in CompiledFunctions?
TRINH Tôi là giáo viên. Trường LTV sắp xây đó bạn. Cuối tháng Năm này là đập trường đó. Bạn học khoá bao nhiêu? Lớp chuyên gì?
Feb
16
comment How to avoid CopyTensor in CompiledFunctions?
Trinh. Bạn có học tại trường Lương Thế Vinh, Đồng Nai không?
Feb
11
comment How to substitute the following conditions into an expression?
Thank you for your answer.
Jan
15
comment Find all values of the paramaters $m$ for which the equation has four roots smaller 2
How about with equation t^4 + 2 (m + 1) t^2 + m + 7==0?