A real valued function f(x) satisfies th...

A real valued function f(x) satisfies the functional equation `f(x-y) = f(x) f(y) - f(a-x) f(a+y)`, where a is a given constant and f(0)=1 , f(2a-x) =?

`-f(x)`

f(x)

f(a-x)

f(-x)

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