My Math Forum Simplify Cos

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 September 11th, 2013, 07:39 PM #1 Senior Member   Joined: Apr 2013 From: Ramallah, Palestine Posts: 349 Thanks: 0 Simplify Cos simplify $cos(sin^{-1} 3/5)$ so; $sin y$ = $\frac{3}{5}$ $a^2 + (3)^2 = (5)^2 a^2 + 9 = 25 a^2 = \sqrt{16} a = 4$ So how would I write the answer? I know that $cos= \frac{4}{5}$ but is that the actually answer? It didn't ask me for cos of anything. It just said simplify. And will the changing $cos(sin^{-1})$ to $sin y$ trick I used work? Thanks in advance for all of your help. I've gotten so much better at Math thanks to this forum. Sham
 September 12th, 2013, 04:55 AM #2 Math Team   Joined: Sep 2007 Posts: 2,409 Thanks: 6 Re: Simplify Cos What do you think "simplify" means? It you have a complicated expression that turns out to be equal to a single number, then that number is as "simple" as you are going to get!
 September 12th, 2013, 06:05 AM #3 Senior Member   Joined: Apr 2013 From: Ramallah, Palestine Posts: 349 Thanks: 0 Re: Simplify Cos

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