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How to find $f(x)$ from $f(g(x))$, $g(x)$, ex:

$g(x)=1-x^2$

$f(g(x))=(x^4+x^2)/(1+x^2)$

$f(1/2)=$

use matlab code....I don't know..help me thanks a lot!

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    When is $g(x)$ equal to $\frac12$?2012-12-28
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    Assuming you just want to use it for numeric calculations you do not need the symbolic toolbox, you can just define functions f and g, and then you can call them as f(g(x))2012-12-28

4 Answers 4