Find the values of b for which the function f(x) = sin x – bx + c is a decreasing function on R ?

Question

Philoid · Accepted Answer

We have,

f(x) = sin x – bx +c

Given that f(x) is on decreasing function on R

for all x R

⇒ for all x R

⇒ b < for all x R

But the last value of cos x in 1