Question:
Find all functions satisfying
f(x+y)+f(x-y)=2f(x)f(y)
for all real numbers , given that
f(0)=1.
Determine every possible function .
Question:
Find all functions satisfying
f(x+y)+f(x-y)=2f(x)f(y)
for all real numbers , given that
f(0)=1.
Determine every possible function .
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