when question ask to prove fog= IA or IB. what is Iand IB? and what is the difference between Iand IB

Dear Student,
Please find below the solution to the asked query:

I is known as identity function which is y=x.i.e. fog=xNow A and B must signify the domain under which function fog is identityfunction.Provide complete question of you are still having problem.

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