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If f^(x)=-f(x) and g(x)=f^(prime)(x) and...

If `f^(x)=-f(x)` and `g(x)=f^(prime)(x)` and `F(x)=(f(x/2))^2+(g(x/2))^2` and given that `F(5)=5,` then `F(10)` is equal to 5 (b) 10 (c) 0 (d) 15

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