text: I want to find an equation for symbolic regression. The vocabulary of allowed variables are: {sin, cos, exp, log, +, *, **, -, x, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10} where {sin, cos, exp, log} are unary operators, {+, *, **, -} are binary operators, {x} is the variable, and {1,2,3,4,5,6,7,8,9,10} are integer coefficients. Only generate one equation from this vocabulary and say no words. Generate a valid equation different from the templates. Some template answers are:  
  3*exp(x)
  x+sin(x)
  x^2+cos(x)
  exp(5*x)+log(x)
  cos(x)
  x^3+2*x^2-1