Question

The interval of increase of the function f(x)=x - e^{​​​​​​x} + tan(2π/7) is

Answer 1

f(x) is increasing if f'(x) >0
f '(x) = 1 - e^{​​​​​​x}

1-e^x>0
e^x < 1
x <0
(-infinity,0)