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Suppose f(x)=e^(a x)+e^(b x) , where a!=...

Suppose `f(x)=e^(a x)+e^(b x)` , where `a!=b ,` and that `f prime prime(x)-2f^(prime)(x)-15f(x)=0` for all `xdot` Then the value of `(|a b|)/3` is ___

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