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## Main Question or Discussion Point

if

f(x+y) + f(x-y) =2f(x)f(y)

and f(0)=k

then find f(x)?

What should be approach followed to solve this question .

plz ans it soon

f(x+y) + f(x-y) =2f(x)f(y)

and f(0)=k

then find f(x)?

What should be approach followed to solve this question .

plz ans it soon