# f(f(g)) problem

#### jamt1961

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 donâ€™t know whether that is correct.
Can anyone here help?

Last edited by a moderator:

#### skipjack

Forum Staff
It's incorrect.

f(g(x)) = - (5cos(pi*g(x)))/(2) - 6

Now replace g(x) in the right-hand side with -(3x/2).

#### jamt1961

Thanks

Thanks for your kind reply!
//Ulf

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