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dy/dx-y=1-e^-x represent a curve y=f(x) ...

`dy/dx-y=1-e^-x` represent a curve `y=f(x)` such that `lim_(x to 0) f(x)` is finite. Intercept of tangent at `x=0` on x-axis and y-axis are a and b respectively then `(a-4b)` is equal to

A

1

B

2

C

-1

D

3

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