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If the function f satisfies the reation `f(x+y)+f(x-y)=2f(x) f(y) Aax,yin RR and f(0) ne 0` then ____

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If the function f satisfies the reation `f(x+y)+f(x-y)=2f(x) f(y) Aax,yin RR and f(0) ne 0` then ____
A. `f(x)` is an function
B. `f(x)` is an odd function
C. If `f(2)=a` then `f(-2)=a`
D. If `f(4) =b` then `f(-4) =-b`
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1 Answer

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Correct Answer - a,c
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