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If `f(a)=2,f^(prime)(a)=1,g(a)=-1,g^(prime)(a)=2,` then the value of `lim_(x->a)(g(x)f(a)-g(a)f(x))/(x-a)` is (a)`-5` (b) `1/5` (c) `5` (d) none of these

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