Q. 454.7( 3 Votes )

Mark the correct alternative in the following:

The range of is

A. [1/3, 1]

B. [-1, 1/3]

C. (-∞, -1) [1/3, ∞)

D. [-1,3, 1]

Answer :

we know, -1≤cosx≤1

-2≤-2cosx≤2


-1≤(1-2cosx)≤3



So, R(f)=[-1, 1/3]


Option ..B

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