finding four solution in an interval

(e^-2x)sin(x+4)=0.4 has four solutions in the interval-5<x <5. how do i find these solutions?

Answer 1

[Roger Stafford]

Use matlab function 'fzero' to find solution to

   fun = @(x) exp(-2*x).*sin(x+4)-0.4;
   x = fzero(fun,x0);

where x0 is an approximation for the solution. In your case you will have to do this four times with four different values of x0.

[Yashendra Mohan]

I am using symbolic variables, which are in an array. Here 'A' is my array containing symbolic variable 'b'.

yy = zeros(1,5);
for n = 1:5                                 
    yy(n) = vpasolve(det(A)==0,b,[0,100],'Random',true);
end

In this above code, I am using for loop. Here I am running it 5 times which will give me 5 solutions in that interval. Is there any way to get all solutions in a particular function.