My Math Forum f(f(g)) problem

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 July 14th, 2019, 12:55 AM #1 Newbie   Joined: Jul 2019 From: Sweden Posts: 2 Thanks: 0 Math Focus: Algebra. f(f(g)) problem Hello everybody, I am a noob in this forum. I have a problem combining two functions. f(x) is: - (5cos(pi*x))/(2) - 6. g(x) is: -(3x/2). For f(g(x)) I have gotten the following result: (15cos(pi*x))/(4) - 6, but I don’t know whether that is correct. Can anyone here help? Last edited by skipjack; July 14th, 2019 at 02:21 AM.
 July 14th, 2019, 02:24 AM #2 Global Moderator   Joined: Dec 2006 Posts: 21,113 Thanks: 2327 It's incorrect. f(g(x)) = - (5cos(pi*g(x)))/(2) - 6 Now replace g(x) in the right-hand side with -(3x/2).
 July 14th, 2019, 09:41 PM #3 Newbie   Joined: Jul 2019 From: Sweden Posts: 2 Thanks: 0 Math Focus: Algebra. Thanks Thanks for your kind reply! //Ulf

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