if my function of f(x) = tan(x) does this mean at places like pi/2 the derivative will not exist? where the vertical asymptote is i mean
Not quite making sense. You can't have an asymptote at (0,0) - or at any other point. A vertical asymptote might be x = 0 (the y-axis). Your function is niether bounded nor continuous at any vertical asymptote. What does this say of the derivative?
@tkhunny i reworded it better
It is better. It can still be improved. Really, there is no need to try to save time by faikling to write necessary ingredients of your language. "pi/2" is just a number. An asymptote would be at x = pi/2. It's the definition of a location and a vertical line. The previous response still answers your actual question, notation notwithstanding.
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