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If F(x)=f(x)dotg(x) and f^(prime)(x)dot...

If `F(x)=f(x)dotg(x)` and `f^(prime)(x)dotg^(prime)(x)=c ,` prove that `(F")/F=f^(primeprime)/f+g^(primeprime)/g+(2c)/(fg)&F^(primeprimeprime)/F=f^(primeprimeprime)/f+g^(primeprimeprime)/g`

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