Domain involving cos and tan

Question

suppose x is in the interval [0, π], and it is not in the domain of tan (x). what is cos(2x)? use decimal notation in your answer.

Answer 1

At x = 0 and x = pi you have vertical asymptotes. They are not defined because tan(x) goes to +/- infinity depending on the side that the limit is approached from. Anyway, you can evaluate cos(2x) for these two points.

Please consider a tutor.