Q. 314.0( 4 Votes )

If f(x) = cos<sup A. f(x) < 1

B. f(x) = 1

C. 2 < f(x) < 1

D. f(x) ≥ 2

[Hint: A.M ≥ G.M.]

Answer :

We have, f(x) = cos2x + sec2x


We know that, A.M ≥ G.M.





cos02x + sec2x ≥ 2


f(x) ≥ 2

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