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: Solving a Trig Inverse.

  1. Nov 29, 2008 #1
    1. The problem statement, all variables and given/known data
    Solve arctan 3x + arctan 2x= pie/4?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 29, 2008 #2
    there is a trig identiy that helps.

    arctan[x]+arctan[y] = arctan[(x+y)/(1-xy)]

    then it is just the angle that has a tan of pi/4 (i am assuming radians), so 1

    then solving 5x/(1-6x^2)=1 we get x= 1/6 and x=-1
    reject the -1 as the domain of arctan does not include it if is re-inserted into the fuction.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...