lst=[["(x^6-x^5+x^4-x^3+1)*exp(x)","x",1],
["(-x^2+2)*exp(x/(x^2+2))/(x^3+2*x)","x",1],
["(2*x^4-x^3+3*x^2+2*x+2)*exp(x/(x^2+2))/(x^3+2*x)","x",1],
["(1+exp(x))*exp(exp(x)+x)/(exp(x)+x)","x",1],
["(x^3-x^2-3*x+1)*exp(1/(x^2-1))/(x^3-x^2-x+1)","x",1],
["exp(1+1/log(x))*(-1+log(x)^2)/log(x)^2","x",1],
["exp(x+1/log(x))*(-1+(1+x)*log(x)^2)/log(x)^2","x",1]]