My Math Forum Solve this Trig Identity

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 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 Thanks from jpac
 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?

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