What is the limit of #arctan(e^x)# as x goes to infinity? Calculus Limits Limits at Infinity and Horizontal Asymptotes 1 Answer Konstantinos Michailidis Sep 25, 2015 Refer to explanation Explanation: We know that #lim_{x to +infty} e^x=+infty# and #lim_{x to +infty} arctan x=pi/2# from the stuy of #e^x# and of #arctan x#. So, as #x to infty#, #e^x to infty# so that, letting #t=e^x# we have #lim_{x to infty} arctan(e^x)=lim_{t to infty} arctan(t)=\pi/2#. Answer link Related questions What kind of functions have horizontal asymptotes? How do you find horizontal asymptotes for #f(x) = arctan(x)# ? How do you find the horizontal asymptote of a curve? How do you find the horizontal asymptote of the graph of #y=(-2x^6+5x+8)/(8x^6+6x+5)# ? How do you find the horizontal asymptote of the graph of #y=(-4x^6+6x+3)/(8x^6+9x+3)# ? How do you find the horizontal asymptote of the graph of y=3x^6-7x+10/8x^5+9x+10? How do you find the horizontal asymptote of the graph of #y=6x^2# ? How can i find horizontal asymptote? How do you find horizontal asymptotes using limits? What are all horizontal asymptotes of the graph #y=(5+2^x)/(1-2^x)# ? See all questions in Limits at Infinity and Horizontal Asymptotes Impact of this question 15076 views around the world You can reuse this answer Creative Commons License