Let F(x) =(f(x/2))^(2) +(g(x/2))^(2). F(...

Let `F(x) =(f(x/2))^(2) +(g(x/2))^(2). F(5)=5` and `f''(x) =-f(x), g(x) = f'(x)`, then `F(10)` is equal to:

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