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