@acer sir, from three set of solutions, I want to take only single set because if I put one  set of solution in the expression to get the exacyly same exact solution which is required in the form of

Is it possible from the three set of solutions i take the value of the constant according to my  choice and which  values of constsnts who satisfied my exact solutions?

@acer sorry x is wrote by mistake .I used k in place of x and k is neither variable nor parameter .Here want to find single set of solution.

@acer yes i am solving symbolically for some variable in term of remaining parameters. I have this {omega, a[-1], a[0], b[-1]} as a variable and this {a[1],b[0]} as a free parameter. I solved system from your ideas but i did not achive required answer. 

Sir, I am asking you when i apply this command values := solve(sys, {a[-1], a[0], a[1], b[-1], b[0], b[1]}); on system of equations.I keep three solution sets but i want to find single set of solution like this {a [-1]=0,b[1]=,a [0]=0

b[0]=a [1],b [-1]=0,a [1]=a[1]}. Acually i want to find exact solution  of problems.

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