Question

Question #c56c6

Answer 1

Start by finding the derivative.

`y' = 1 - (-sinx)`

`y' = 1 + sinx`

A horizontal tangent line will have a slope of `0`. Since `f'(a) = m`, where `m` is the slope of the tangent, we have:

`1 = 1 + sinx`

`sinx= 0`

`x = 2pin, pi + 2pin`

Hopefully this helps!