
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
January 28th, 2011, 06:41 PM  #1 
Newbie Joined: Nov 2010 Posts: 9 Thanks: 0  Trigonomic Identity!! Driving me CRAZY
Sin^2?+2cos?1..........1  =  2+cos?cos^2?........1+sec? I've been at it for 2 days and I can't friggen get it! Please help DX (The "....." is meant to show the gap between fractions, the forum ignores numerous spaces!" 
January 28th, 2011, 06:51 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs  Re: Trigonomic Identity!! Driving me CRAZY
Let's start with the left side: Use the Pythagorean identity in the numerator, i.e Collect like terms: Factor numerator and denominator: Divide out common factors: Divide numerator and denominator by 
January 28th, 2011, 07:05 PM  #3  
Newbie Joined: Nov 2010 Posts: 9 Thanks: 0  Re: Trigonomic Identity!! Driving me CRAZY Quote:
Can you please elaborate on this step? Why are we dividing Num and Denom by Cos theta? And how does that turn it into Sec theta?  
January 28th, 2011, 07:09 PM  #4 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs  Re: Trigonomic Identity!! Driving me CRAZY
If we do this division, then we get the expression into the required form. 

Tags 
crazy, driving, identity, trigonomic 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
I have this homework that is driving me crazy  DANDIS  Advanced Statistics  2  December 24th, 2011 02:12 PM 
An easy equation driving me crazy  failiure  Algebra  9  August 7th, 2011 10:26 AM 
Problems driving me crazy.(Primes,Fermat,Euler)  usermind  Number Theory  1  October 5th, 2010 10:30 AM 
THIS QUESTION IS DRIVING ME CRAZY.. PLZ HELP !!  kzeidan  Algebra  3  January 25th, 2009 01:33 PM 
Trigonomic Identities Question  fischer  Algebra  3  May 15th, 2008 02:20 AM 