Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Trig identity and equation

  1. Oct 26, 2008 #1
    1. The problem statement, all variables and given/known data

    cos(squared)x = sinx-1/2

    2. Relevant equations

    cos(squared)x= 1-sin(squared)x

    3. The attempt at a solution

    I tried everything but my answer does not match my answers in calculator
     
  2. jcsd
  3. Oct 26, 2008 #2
    If [tex]cos^2(x) = sin(x)-0.5[/tex] and [tex]cos^2(x) = 1-sin^2(x)[/tex], then wouldn't you agree that [tex]sin(x)-0.5 = 1-sin^2(x)[/tex]? That's a quadratic equation.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook