Passage - 3 (Questions 67 to 69) Consider, ,

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

Passage - 3 (Questions 67 to 69) Consider,

f(x)=\cos 2x+2x\lambda^2+(2\lambda+1)(\lambda-1)x^2

\lambda\in R

. If

f(x)

is increasing for all

x\in R

then number of values of

\lambda

is (a) 1 (b) 2 (c) 3 (d) infinite