Results 1 to 2 of 2

Math Help - prove that cos^2x+tan^2xcos^2x=1

  1. #1
    Senior Member
    Joined
    Nov 2008
    Posts
    425

    prove that cos^2x+tan^2xcos^2x=1

    can you explain all steps please because:
    I did it and I got down to LS:
    (1-sin^2x)/sin^2x
    so the answer on the left side would be 0,
    but I dont think that is right, where would my error be?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Dec 2008
    From
    Scotland
    Posts
    901
    Quote Originally Posted by skeske1234 View Post
    can you explain all steps please because:
    I did it and I got down to LS:
    (1-sin^2x)/sin^2x
    so the answer on the left side would be 0,
    but I dont think that is right, where would my error be?
     \tan^2(x) = \frac{\sin^2(x)}{\cos^2(x)}

    Hence:

     \cos^2(x) \tan^2(x) =  \cos^2(x)\frac{\sin^2(x)}{\cos^2(x)}= \sin^2(x)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. prove pr(E)=0
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: September 20th 2010, 01:31 PM
  2. integrate sin^2xcos^4x
    Posted in the Calculus Forum
    Replies: 3
    Last Post: April 2nd 2010, 02:47 AM
  3. Prove
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 11th 2009, 01:27 AM
  4. Replies: 2
    Last Post: August 28th 2009, 02:59 AM
  5. prove
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: September 26th 2008, 07:41 AM

Search Tags


/mathhelpforum @mathhelpforum