For any function and the identity function on

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

For any function

f:A\to B

and the identity function

I_A

on

A

,

(f\circ I_A)(x)

is equal to (a)

f(f(x))

(b)

x

(c)

f(x)

(d)

I_A(f(x))

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