Find the values of `' a '` for which the function `f(x)=sinx-a x+4` is increasing function on `R` .

Explanation

We have given

`f(x)=sinx-a x+4`

Then,

`f'(x)=cosx-a`

Then for increasing function

`f'(x)>=0`

`cosx−a>=0`for all `x in R`

or

...