## 300 Reputation

12 years, 258 days

## How to write the equation of the plane p...

Maple
`I want to write the equation of the plane passing through the three points A, B, C has the form ax + by + cz + d = 0 where a, b, c, d are integer numbers, a >0 if a <> 0; b>0 if a = 0 and b<>0,...and igcd(a, b, c) = 1.If the coordinates of the vertices A, B, C are all integers, for example A(2,2,2), B(1,2, -1), C(1,-1,-4), I tried,with(geom3d):point(A,2,2,2):point(B,1,2, -1):`

## How to find vertices of an equilateral t...

I want to find a triangle with the vertices A(x1, y1, z1), B(x2, y2, z2), C(x3, y3, z3) knowing that the point G(1,1,1) is centroid of the triagle ABC and x1, y1, z1, x2, y2, z2, x3, y3, z3 are integer numbers, but I can not find. How do I tell Maple to do that?

## How to write all tangent of planes of a ...

I have a list L. In geom3d, I want to write all tangent of plane of the spherefrom L. But I don't know. I only write one point . I tried

> restart:

with(geom3d):

L:=[[-5, -5, 8], [-5, -1, 10], [-5, 3, 10], [-5, 7, 8], [-5, 8, -5], [-5, 8, 7], [-5, 10, -1], [-5, 10, 3], [-1, -5, 10], [-1, 7, 10], [-1, 10, -5], [-1, 10, 7...

## How do I solve this equation?...

Maple 15
`I want to solve the equation f(f(-1))=sqrt(2)+g(f(2)), where`
`f:=x->a/x^2-3*x+2 and g:=x->a*sin(2*x), a is an unknow. I tried`
`restart:f:=x->a/x^2-3*x+2:g:=x->a*sin(2*x):solve(f(f(-1))=sqrt(2)+g(f(2)),a):evalf(%);`
`and receive 13.02210936+4.135282756*I. `

## How to select all even numbers of a list...

I have a list [1, 2, 3, 11, 29, 88, 252, 739, 2146, 6257, 18213, 53051, 154484, 449908, 1310217, 3815674, 11112091, 32360987, 94242573, 274456016]. How to select all even numbers of this list?

 First 8 9 10 11 12 13 14 Last Page 10 of 28
﻿