Question
Mathematics Question on Increasing and Decreasing Functions
The values of b for which the function f(x) = cos x + bx+ a decreases on R are
A
[−1, 1]
B
(-∞, 1]
C
(-∞, -1]
D
(-1, 1)
Answer
(-∞, 1]
Explanation
Solution
The correct option is(B):(-∞, 1]