
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
July 24th, 2018, 12:23 AM  #1 
Newbie Joined: Dec 2009 Posts: 8 Thanks: 0  One exponential equation
Equation 81^\sin^2 x+81^\cos^2 x=30 can easy be solved by substitution 81^\sin^2 x=t What about equation 81^\sin2x+81^\cos2x=30? I think it doesn't have real solutions. Last edited by skipjack; July 24th, 2018 at 12:50 AM. 
July 24th, 2018, 12:52 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,747 Thanks: 2133 
It seems to have real solutions. Why do you think it doesn't?


Tags 
equation, exponential 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
exponential equation  panky  Calculus  2  April 7th, 2017 07:34 PM 
exponential equation  Krvila4n9k  Number Theory  10  September 29th, 2015 12:06 PM 
Exponential equation  panky  Algebra  0  May 20th, 2015 10:52 PM 
exponential equation  orhmalca  Algebra  10  November 19th, 2014 10:05 PM 
exponential equation.  panky  Algebra  7  January 16th, 2012 05:34 PM 