1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Which of these relations are functions of x on R

  1. Nov 7, 2016 #1
    Mentor note: moved to homework section

    y = sin(x)
    y = cos(x)
    y = tan(x)
    y = csc(x)
    y = sec(x)
    y = cot(x)

    (a) 0 (b) 4 (c) 6 (d) 2
    I thought it was (c) because i graphed all the trig functions and they passed the vertical line test but the answer sheet is saying (d) 2
    Last edited by a moderator: Nov 7, 2016
  2. jcsd
  3. Nov 7, 2016 #2


    User Avatar
    Science Advisor

    "on R" is referring to the domain of function being all real numbers. Only sine and cosine satisfy this.
  4. Nov 7, 2016 #3
    oh true, thats where i was confused i think then, so is that because the others have vertical asymptotes ?
  5. Nov 7, 2016 #4


    User Avatar
    Science Advisor
    Homework Helper

    no, it is because they are not defined at the x coordinate of the vertical asymptote. but i think that is what you meant.
  6. Nov 7, 2016 #5
    yeah thats what i was meaning, thanks
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted