Honestly, I am quite confused with the question because there are two many unknowns. You gave a point but with unknown coordinates. I can possibly get the angle if the coordinates were given using the angle of inclination equation in analytical geometry. But, in the end, you just want to know the value of cot e, where e is a real number. In mathematics, e is an irrational number called the Euler number. Its exact value is 2.7182818284590452353602874713527. That would be too length to use, hence, they assigned the term e for this.
So, all we have to do is find the cotangent of the Euler number. Cotangent is the inverse of the tangent function. So,
cot e = 1/(tan e) = 21.06212265
Therefore, the value of cot e is 21.06.