August 21st, 2018, 09:51 AM  #1 
Newbie Joined: Aug 2018 From: MN Posts: 2 Thanks: 0  Solve this Trig Identity
cot^2a = cos^2a + cota*cosa

August 21st, 2018, 11:27 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,531 Thanks: 1390 
assuming you mean $\cot^2(a) = \cos^2(a)+\cot(a)\cos(a)$ this doesn't appear to be true 
August 21st, 2018, 11:51 AM  #3 
Newbie Joined: Aug 2018 From: MN Posts: 2 Thanks: 0 
I also did not think so. I think it is a typo.

August 21st, 2018, 04:08 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,933 Thanks: 2207 
Were you supposed to be proving an identity or solving an equation?


Tags 
identity, solve, trig 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Trig Identity  hyperbola  Trigonometry  5  February 22nd, 2015 09:03 AM 
Trig Identity  WWRtelescoping  Trigonometry  1  February 25th, 2014 05:40 PM 
Trig Identity  heinzelmannchen  Trigonometry  4  December 9th, 2013 01:44 AM 
trig identity  najaa  Trigonometry  6  May 14th, 2012 03:30 PM 
trig identity  Stringbags  Algebra  2  March 22nd, 2009 03:39 PM 