The interval of increase of the function `f(x)=x-e^x+tan(2pi//7)` is (a) `(0,\ oo)` (b) `(-oo,\ 0)` (c) `(1,\ oo)` (d) `(-oo,\ 1)`

Explanation

Correct option is B)
`

f(x)=x-e^{x}+tan frac{2 pi}{7}`
`


f^{prime}(x)=1-e^{x}`


for increasing
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