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Oct
13
comment Heron's formula for area of a triangle
I used a = {-1, 0}; b = {1, 0}; c = {0, 1}; s = 1/2 Abs[Det[{a - b, a - c}]]
Oct
10
comment How can I get the exact solution of this equation (inequality equation)?
I think, Thread[Power[Sqrt[8 16^x - 1/2 9^x] == 3 4^x - 3^x, 2], Equal]; Reduce[{%, 3 4^x - 3^x >= 0} , x, Reals] // Simplify
Oct
10
accepted How can I get the exact solution of this equation (inequality equation)?
Oct
10
revised How can I get the exact solution of this equation (inequality equation)?
added 234 characters in body
Oct
10
asked How can I get the exact solution of this equation (inequality equation)?
Oct
5
comment Find the value of parameter so that the equation has one solution
@Michel E2 If I want to the equation $x^4+2(m+1)x^2 - m - 4 =0$ has three reals solutions. How can I get it?
Oct
3
accepted How to get a list of pairs into the form $(x,y)$?
Oct
3
comment How to get a list of pairs into the form $(x,y)$?
In my country, the pair of solution must be formated like that. After Mathematica out put, I use TeXform to convert them.
Oct
3
asked How to get a list of pairs into the form $(x,y)$?
Sep
26
comment How to choose three points on the circle so that the triangle is not a right triangle?
Thank you very much.
Sep
25
comment How to choose three points on the circle so that the triangle is not a right triangle?
@SjoerdC.deVries, You said "The remaining 24 have a right angle, just put a Not in front of the FreeQ above to find them". I dont know how to put the FreeQ. Please write for me that command. Thank you.
Sep
23
revised Is there a triangle like this?
added 141 characters in body
Sep
17
revised Is there a triangle like this?
added 350 characters in body
Sep
17
comment Is there a triangle like this?
The solutions changes automatically? Is it fixed? How to change it?
Sep
17
comment Is there a triangle like this?
How to choose the number a, b, c, x1, x2, x3?
Sep
17
comment Is there a triangle like this?
@belisarius Can I get a triangle with the small coordinates of the point A, B, C?
Sep
16
revised Is there a triangle like this?
added 260 characters in body
Sep
16
revised Is there a triangle like this?
deleted 4 characters in body
Sep
16
answered Is there a triangle like this?
Sep
15
accepted Is there a triangle like this?