//Printing table header
cout<<"\"<<"t";
for (x=-1; x<=1; x+=.9)
{
cout<<x<<"t";
}
cout<<endl;
for (y=-2;y<=2;y+=1)
cout<<y<<"t";
for (x=-1;x<=1;x+=.9)
if (x*y > 0)
z = log(sqrt(a*pow(x,2) + b*pow(y,2)));