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Let f(x+y)+f(x-y)=2f(x)f(y) AA x,y in R ...

Let `f(x+y)+f(x-y)=2f(x)f(y) AA x,y in R` and `f(0)=k`, then

A

I,III

B

II,III

C

I,II

D

III,IV

Text Solution

Verified by Experts

The correct Answer is:
A
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