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Let f be a function satisfies the relation f(x+y)+f(x−y)=2f(x)f(y) ∀ x,y∈R. If f(5)=10 and f(0)≠0, then f(−5)=

Answer» Let f be a function satisfies the relation f(x+y)+f(xy)=2f(x)f(y) x,yR. If f(5)=10 and f(0)0, then f(5)=


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