Show that for a ≥ 1,f(x) = √3 sin x - cos x - 2ax + b is decreasing in R.

Show that for a ≥ 1f(x) = √3 sin x - cos x - 2ax + b is decreasing in R.

We have f(x) =  √3 sin x - cos x - 2ax + b ,∴ f'(x) = √3 cosx + sinx - 2a  ,