Discussion Forum



1)

The function  f (x) = sin x - kx - c where k and c are constants, decreases always when


A) k>1

B) k=1

C) k<1

D) k=1

Answer:

Option B

Explanation:

Let f (x) = sin x - kx - c where k and c are constants

f'(x) = cos x - k

.'. f decreases if cos x ≤ k

Thus, f (x) = sin x - kx - c decrease always when k ≥1