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: Trig Identity Simplification

  1. Aug 24, 2012 #1
    1. The problem statement, all variables and given/known data

    Simplify the following:

    (1/cos2θ) - (1/cot2θ)

    2. Relevant equations

    Various trig identities

    3. The attempt at a solution

    I tried to make cos2θ into 1-sin2θ and cot2θ into csc2θ-1 but still couldn't find any obvious solution. Help?
  2. jcsd
  3. Aug 24, 2012 #2
    What do you get if you express cot as something using sines and cosines?? What if you then add up the fractions?
  4. Aug 25, 2012 #3
    Did you try simply inverting both fractions? Does that show similarity to a trigonometric identity that you know?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook