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If 8f(x)+6f(1/x)=x+5 and y=x^2(f(x), the...

If `8f(x)+6f(1/x)=x+5` and `y=x^2(f(x),` then `(dy)/(dx)` at `x=-1` is equal to 0 (b) `1/(14)` (c) `-1/4` (d) None of these

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