## 6 Badges

7 years, 134 days

## How do I construct one option of a quadr...

I want to construct a quadrilateral ABCD with A = 120 degrees, B = 80 degrees, C = 110degrees. I do know how to start. How do I construct one option of a quadrilateral with measure of its four angles?

## How do I solve this trigonometric equati...

Maple

I am trying to solve the equation:
solve(cos(3*x - Pi/12) = cos(2*x + Pi/7), x, allsolutions).
It is difficult for me to get the resullt.
Solve by my hand. I tried
restart;
a := 3*x - Pi/12;
b := 2*x + Pi/7;
S1 := solve(a = 2*Pi*k + b, x);
S2 := solve(a = 2*Pi*k - b, x);
S := ((S1 union S2) assuming k::integer);

I get the answer

Can I get the result by command
solve(cos(3*x - Pi/12) = cos(2*x + Pi/7), x, allsolutions).

## Can this equation (x-a)^4 + (x-b)^4 = c ...

Maple

I am trying to find three integer a, b, c so that equation (x-a)^4 + (x-b)^4 = c has four different solutions integer x. I tried

restart;
k := 0;
for a from -10 to 10 do
for b from -10 to 10 do
for c from -10 to 10 do
if a*b*c <> 0 and igcd(a, b) = 1 then X := [solve((x - a)^4 + (x - b)^4 = c, x)]; if type(X[1], integer) and type(X[2], integer) and type(X[3], integer) and type(X[4], integer) and nops({X[1], X[2], X[3], X[4]}) = 4 then k := k + 1; L[k] := [a, b, c, X[]]; end if; end if; end do; end do;
end do;
L := convert(L, list);
k;

L;

I do not get any solution

## How do I calculate volume of a polyhedro...

Maple

I have a polyhedron with A(1,1,0), B(-1,1,0), C(-1,-1,0), H(-1/2,0,1), K(1/2,-1/2,0). How can I calculate volume of polyhedron ABCHK?

## How to solve this system of quations to ...

Maple

I want to put one option of tetrahedron SABC with AB=c, BC=a, AC=b, SA=m, SB=n, SC=p. I tried
restart;
with(Student:-MultivariateCalculus);
A := [0, 0, 0];
B := [c, 0, 0];
C := [(-a^2 + b^2 + c^2)/(2*c), sqrt((a + b - c)*(a - b + c)*(-a + b + c)*(a + b + c))/(2*c), 0];
S := [x, y, z];
solve([distance(S, A) = m, distance(S, B) = n, distance(S, C) = p], [x, y, z]);

I got warning, solutions may have been lost. How can I solve that system of equations?

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