Thank you very much. It's such an impresive way.

Thank you very much. It's such an impresive way.

@Carl Love 

Here is the ordinary keyboard characters for the expression:

ln(product((p*beta[1]*(t[i]/theta[1])^(beta[1]-1)*exp(-(t[i]/theta[1])^beta[1])/theta[1])^Y[i]*beta[2]*(t[i]/theta[2])^beta[2]/(t[i]*exp((t[i]/theta[2])^beta[2])*((1-p)*beta[2]*(t[i]/theta[2])^(beta[2]-1)*exp(-(t[i]/theta[2])^beta[2])/theta[2])^Y[i])-(p*beta[1]*(t[i]/theta[1])^(beta[1]-1)*exp(-(t[i]/theta[1])^beta[1])/theta[1])^Y[i]*beta[2]*(t[i]/theta[2])^beta[2]*p/(t[i]*exp((t[i]/theta[2])^beta[2])*((1-p)*beta[2]*(t[i]/theta[2])^(beta[2]-1)*exp(-(t[i]/theta[2])^beta[2])/theta[2])^Y[i]), i = 1 .. n))

This is the correction of the first expression. I'm really sorry for making mistake on copying the expression. The first expression should be on ln, here it is

Here is the expression that I would solve

> f := product((p*beta[1]*(t[i]/theta[1])^(beta[1]-1)*exp(-(t[i]/theta[1])^beta[1])/theta[1])^Y[i]*((1-p)*beta[2]*(t[i]/theta[2])^(beta[2]-1)*exp(-(t[i]/theta[2])^beta[2])/theta[2])^(1-Y[i]), i = 1 .. n);
print(`output redirected...`); # input placeholder

I expect to get this form from above expression