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If `f (a) =2, f '(a) =1, g (a) =-3 .g'(a) =-1 ,` then the value of `lim _(xtoa)(f(a) g(x) -g(a)f(x))/(a-x)` is equal to-

A

1

B

`-1`

C

6

D

`-5`

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A
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