August 21st, 2018, 10:51 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, 12:27 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,202 Thanks: 1157 
assuming you mean $\cot^2(a) = \cos^2(a)+\cot(a)\cos(a)$ this doesn't appear to be true 
August 21st, 2018, 12:51 PM  #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, 05:08 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 19,977 Thanks: 1852 
Were you supposed to be proving an identity or solving an equation?


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