1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Fundamental Identities

  1. Dec 2, 2009 #1
    1. The problem statement, all variables and given/known data
    Okay, so this is some trig I learned last year but have since forgotten. If you can give me the first step, I can solve the rest on my own. The given statement is true and you have to prove why using Pythagorean Identities.

    csc2[tex]\alpha[/tex]-1 = cos2[tex]\alpha[/tex]
  2. jcsd
  3. Dec 2, 2009 #2
    The first step is to just divide the numerator on the left side by the denominator. Try it and you will see how it makes sense.
  4. Dec 2, 2009 #3


    User Avatar
    Science Advisor
    Homework Helper

    You are a little wrong there. I don't have to prove it. YOU have to prove it. csc(alpha)=1/sin(alpha). Just try it. Ok?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook