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!

Solving a trig equation for x

  1. Nov 6, 2011 #1
    1. The problem statement, all variables and given/known data

    Solve for x

    2. Relevant equations

    3. The attempt at a solution
    I don't really know how to start. I know cos^2x+sin^2x=1 but I don't think I can apply that with the 2 thrown in there.
  2. jcsd
  3. Nov 6, 2011 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Observe: cos^2 + 2 sin^2 = (cos^2 + sin^2) + sin^2
  4. Nov 6, 2011 #3
    thank you
  5. Nov 7, 2011 #4


    User Avatar
    Science Advisor

    Or, if it weren't quite that obvious, you could have replaced [itex]cos^2(x)[/itex] with [itex]1- sin^2(x)[/itex]. That is, [itex]cos^2(x)+ 2sin^2(x)= (1- sin^2(x))+ 2sin^2(x)= 1+ sin^2(x)= 1.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Solving a trig equation for x
  1. Solving for x (Trig) (Replies: 3)

  2. Solving Trig Equations (Replies: 11)

  3. Solving trig equations (Replies: 14)