angela_12
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#1
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#1
f(x) = 1-x/1+x
Show that ff(x) = x

How do you find f of f(x)?
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Hammad(214508)
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#2
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substitute f(x) were you have x.
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angela_12
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#3
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(Original post by Hammad(214508))
substitute f(x) were you have x.
There is no value in f(x). So how do I substitute it for x?

The question is: Show that ff(x) = x
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angela_12
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#4
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This question s driving me nuts - does anyone know how to do it?
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username3249896
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#5
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(Original post by ASJ_12)
This question s driving me nuts - does anyone know how to do it?
Do what post 2 said

 ff(x) = \dfrac{1-f(x)}{1+f(x)}

since you know that

 f(x) = \dfrac{1-x}{1+x}

you can replace and simplify to ff(x) = x
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